Which of the following counters is used to measures the number of device interrupts the processor is currently experiencing?

A.
Percent Processor Time

B.
Percent of Interrupt Time

C.
Interrupts Per Second

D.
Percent Total Processor Time

Explanation:
Interrupts Per Second measures the number of device interrupts the processor is currently experiencing.
Incorrect Answers:
A: Percent Processor Time measures the period that a processor is busy executing a non-idle thread. Idle threads are assigned to each processor to consume non-productive clock cycles.
B: Percent of Interrupt Time measures the percentage of elapsed time that the processor spends handling hardware interrupts.
D: Percent Total Processor Time measures the multiprocessor systems only, this counter is used the same way as that for a single CPU counter.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 335, 336