Which of the following scenarios point to a need for an upgrade of current memory with faster RAM chips?

A.
When the memory Pages Input/sec counter reading has a value consistently over 1.

B.
When the memory Pages Input/sec counter reading has a value less than 1.

C.
When the memory Pages Input/sec counter reading has a value of 1 or less than 1.

D.
None of the above

Explanation:
You should strongly consider an upgrade of current memory with faster RAM chips when the memory Pages Input/sec counter reading has a value of 1 or less than 1. This condition usually points to a RAM bottleneck because all memory usage is occurring within physical RAM, without a swap file.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 390-391.