Last visit was: 20 Nov 2025, 04:25 It is currently 20 Nov 2025, 04:25
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 20 Nov 2025
Posts: 105,412
Own Kudos:
778,481
 [5]
Given Kudos: 99,987
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 105,412
Kudos: 778,481
 [5]
1
Kudos
Add Kudos
4
Bookmarks
Bookmark this Post
User avatar
fdfd97
Joined: 14 Mar 2023
Last visit: 27 May 2024
Posts: 40
Own Kudos:
31
 [2]
Given Kudos: 14
Posts: 40
Kudos: 31
 [2]
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
Archit3110
User avatar
Major Poster
Joined: 18 Aug 2017
Last visit: 19 Nov 2025
Posts: 8,423
Own Kudos:
4,982
 [1]
Given Kudos: 243
Status:You learn more from failure than from success.
Location: India
Concentration: Sustainability, Marketing
GMAT Focus 1: 545 Q79 V79 DI73
GMAT Focus 2: 645 Q83 V82 DI81
GPA: 4
WE:Marketing (Energy)
GMAT Focus 2: 645 Q83 V82 DI81
Posts: 8,423
Kudos: 4,982
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 20 Nov 2025
Posts: 105,412
Own Kudos:
Given Kudos: 99,987
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 105,412
Kudos: 778,481
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Anti-spam software can prevent unwanted mail by either filtering incoming messages with the aid of rule-based filters or asking users to blacklist the addresses sending them junk mail.

A. asking users to blacklist the addresses sending them
B. asking users to blacklist the addresses, sending them
C. by asking users to blacklist the addresses from which they are sent
D. ask users to blacklist the addresses sending
E. by asking users to blacklist the addresses that send



OFFICIAL EXPLANATION



Anti-spam software can prevent unwanted mail by either filtering incoming messages with the aid of rule-based filters or asking users to blacklist the addresses sending them junk mail.

A. asking users to blacklist the addresses sending them

The original sentence correctly uses parallelism with the either...or structure: by either (1) filtering ... or (2) asking ...

Although this answer choice is stylistically flawed because of a pronoun ambiguity (them can refer either to addresses or users), it is the only answer choice that is grammatically correct and retains the original meaning. Therefore, it is the best answer choice.



B. asking users to blacklist the addresses, sending them

Incorrect.

This answer choice changes the original meaning of the sentence. By adding a comma, it separates the phrase sending them junk mail from the original the addresses (that are) sending them junk mail. This new separate phrase implies that the anti-spam software sends junk mail.



C. by asking users to blacklist the addresses from which they are sent

Incorrect.

This answer choice is grammatically incorrect. In the list by either filtering ... or ..., the part of speech that follows either must also follow or. In this answer choice, either is followed by a verb: filtering. Or, however, is followed by a preposition: by.

What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign: (n)either... (n)or...



D. ask users to blacklist the addresses sending

Incorrect.

This answer choice is grammatically incorrect. In the list by either filtering ... or ..., the part of speech that follows either must also follow or. In this answer choice, either is followed by filtering, a V+ing verb. Or, however, is followed by ask, a base formverb.



E. by asking users to blacklist the addresses that send

Incorrect.

This answer choice is grammatically incorrect. In the list by either filtering ... or ..., the part of speech that follows either must also follow or. In this answer choice, either is followed by a verb: filtering. Or, however, is followed by a preposition: by.
Moderators:
GMAT Club Verbal Expert
7443 posts
GMAT Club Verbal Expert
231 posts
189 posts