A memory bottleneck will occur when the percentage of disk time for disks
containing the Pagefile.sys is more than _____________.

A.
5%

B.
8%

C.
10%

D.
20%

Explanation:
If the percentage of disk time is over 10%, the available bytes are around 4 MB, and pages/sec is high, the server is paging a significant number of memory requests to disk and is experiencing a memory bottleneck.
Incorrect Answers
A, B, D: If the percentage of disk time is over 10%, the server is paging a significant number of memory requests to disk and is experiencing a memory bottleneck.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, p. 347