After performing a hard drive upgrade, you should perform a new baseline and compare the results to the previous baseline values. Which objects are used to measure disk performance?

A.
LogicalDisk object

B.
PhysicalDisk object

C.
All of the above

D.
None of the above.

Explanation:
Both the LogicalDisk and PhysicalDisk objects are used to measure disk performance.
You enable these objects using the diskperf command.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 386-387.