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单选题
The statistics for a poorly performing x366 system are as follows:      (1)Processor: 90% for 5 second increments   (2)Memory page faults: 20/second average over 15 minutes      (3)Disk: disk time 1%  Which of the following will provide the greatest performance improvement?()
A

Add memory

B

Add a processor

C

Add a faster disk subsystem

D

Exchange the processor with a faster processor


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