Which of the following disk performance counters shows the current (immediate) number of outstanding requests?

A.
Average Disk Queue Length.

B.
Current Disk Queue Length.

C.
Both of the above.

D.
None of the above.

Explanation:
The Current Disk Queue Length counter shows the current (immediate) number of outstanding requests as well as all requests in service, when the counter was monitored.
Incorrect Answers:
A: The Average Disk Queue Length counter shows the average disk queue length over time value.
C: Current Disk Queue Length is the correct answer.
D: Current Disk Queue Length is the correct answer.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 531-533.