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# A particular computer virus frequently infects personal computers

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SC Moderator
Joined: 13 Apr 2015
Posts: 1689
Location: India
Concentration: Strategy, General Management
GMAT 1: 200 Q1 V1
GPA: 4
WE: Analyst (Retail)
A particular computer virus frequently infects personal computers  [#permalink]

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22 Feb 2017, 19:36
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Difficulty:

55% (hard)

Question Stats:

62% (01:30) correct 38% (02:32) wrong based on 219 sessions

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A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective

B. the virus was able to replicate itself and then send itself to people in the victim's address book

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.
Manager
Joined: 24 Oct 2013
Posts: 140
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Concentration: General Management, Strategy
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A particular computer virus frequently infects personal computers  [#permalink]

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22 Feb 2017, 22:53
Answwer requires us to find an answer that would state "virus is not not blocked and it does exist".

Option A states that it is not detected becasue the virus is build effectively now.

I choose A
SC Moderator
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Concentration: Strategy, General Management
GMAT 1: 200 Q1 V1
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Re: A particular computer virus frequently infects personal computers  [#permalink]

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23 Feb 2017, 22:35
2
Question Type: Complete the passage

Main Point: No virus detection $$\neq$$ Virus installation blocked
Missing Info: The virus may be present in a disguised form

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective - Incorrect. Effectiveness of the virus is not disputed in the argument. Out of context.

B. the virus was able to replicate itself and then send itself to people in the victim's address book - Incorrect. Out of scope.

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active - Incorrect. Out of scope.

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool - Correct. If the virus disguised itself in the system as a virus removal tool then it it undetected.

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system. - Incorrect. Again this is not relevant to the main point.

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Re: A particular computer virus frequently infects personal computers  [#permalink]

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24 Oct 2018, 03:50
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

We need to find a reason to support the point. Only D fits in as it presents the alternate why the virus is not detected even when it's present.
Manager
Joined: 08 Jan 2013
Posts: 67
A particular computer virus frequently infects personal computers  [#permalink]

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24 Oct 2018, 08:42
1
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective. OFS - this does not explain why virus is undetected

B. the virus was able to replicate itself and then send itself to people in the victim's address book. OFS - this does not explain why virus is undetected

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active. OFS - no reason why virus is undetected

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool. Correct

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system. OFS - no reason why virus is undetected
Intern
Joined: 09 Nov 2016
Posts: 4
Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 02:03
D is the most relevant of all. so D should be answer
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Joined: 16 Oct 2017
Posts: 16
Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 02:06
abhijeet4316 wrote:
D is the most relevant of all. so D should be answer

Yes, You are right!
Thanks for the explanation!
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Posts: 8550
Location: Pune, India
Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 04:07
1
Vyshak wrote:
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective

B. the virus was able to replicate itself and then send itself to people in the victim's address book

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.

Premises:
- A particular virus infects the PCs though mail.
- Virus-scanning software alarms of virus shortly after it occurs but it doesn't about this virus.
- But it does not mean that the virus is not installed on the PC because ...

It is a kind of paradox. The virus scanning software is supposed to warn you when virus is installed. But the software does not warn about this virus. But that does not mean it is not installed!

Why?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective
What does "more effective" mean? That it spreads more easily? May be. But we don't know why the software does not alert even when the virus is present.

B. the virus was able to replicate itself and then send itself to people in the victim's address book
What the virus does is irrelevant. We are just wondering why the software does not alert us.

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active
Again, what happens after the virus stops spreading is irrelevant.

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool
This is why! The virus disabled the scanning software. That is why the software does not alert us of its presence. Resolves the paradox. Answer

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.
What the virus does is irrelevant. We are just wondering why the software does not alert us.

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Manager
Joined: 21 May 2017
Posts: 53
Location: India
Re: A particular computer virus frequently infects personal computers  [#permalink]

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25 Oct 2018, 06:33
1
Vyshak wrote:
A particular computer virus frequently infects personal computers through an email message. Even though virus-scanning software installed on a computer is designed to identify and alarm the user of a virus infection on that computer shortly after it occurs, this particular virus is rarely observed by virus-scanning software. This fact, however, does not mean that the computer's security systems have blocked installation of the virus, because _______________.

Which of the following most logically completes the argument?

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective

B. the virus was able to replicate itself and then send itself to people in the victim's address book

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.

A. shortly after it appeared on the Internet, hackers modified the virus in a way that made it more effective--- it can still be detected by virus scanning software ,wrong

B. the virus was able to replicate itself and then send itself to people in the victim's address book--- irrelevant

C. even after the virus had stopped spreading, the backdoors created during the initial infections remained active---incorrect

D. the virus was able to disable virus-scanning software and pose as a virus-removal tool--- relevant

E. the virus also altered the victim's operating system in a way that made it difficult to shutdown the computer without cutting off power to the system.[/quote]-- incorrect
Re: A particular computer virus frequently infects personal computers &nbs [#permalink] 25 Oct 2018, 06:33
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# A particular computer virus frequently infects personal computers

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