When a certain software update is installed on computer systems, the security programs that normally operate within the system typically respond by disabling key monitoring functions, with the result that the systems become vulnerable to serious security breaches. When systems are installed with both the update and a protective patch, security breaches occur far less frequently. The protective patch is known to counteract many effects of the update and does not itself interfere with normal security programs.
Which of the following hypotheses is best supported by the information given?The update tends to cause security programs to disable key monitoring functions, making systems vulnerable. When the patch is installed with the update, breaches happen much less often. Since the patch counteracts many effects of the update and does not itself interfere with security programs,
the most supported explanation is that the patch blocks the update’s harmful effect on
monitoring functions.
A. Installing the protective patch without the update on systems that are not already vulnerable puts the systems at greater risk of security breaches than installing both the update and the patch does.
This is not supported. The passage gives no information about installing the patch without the update.
B. The disabling of monitoring functions is the most common cause of security breaches in computer systems.
This is too broad. The passage discusses these systems after this update, not security breaches in computer systems generally.
C. The protective patch interferes with the tendency of the update to disable key monitoring functions.
This is correct. The update causes monitoring functions to be disabled, and the patch counteracts many effects of the update. Since breaches occur far less often when the patch is installed, it is reasonable to infer that the patch helps prevent the update from disabling those functions.
D. For computer systems, increased vulnerability to security breaches is the most harmful effect of installing the update.
This is not supported. The passage says the update causes serious vulnerability, but it does not compare this effect with all other possible harmful effects.
E. If the protective patch is installed along with the update, the version of the update required to achieve its intended performance improvement can generally be reduced.
This is not supported. The passage says nothing about update versions or performance improvement.
Answer: (C)