Thestatisticsforapoorlyperformingx366systemareasfollows（1）Processor90%for5secondincrements（2）Memorypagefaults20\/secondaverageover15minutes（3）Diskdisktime1%Whichofthefollowingwillprovidethegreatestperformanceimprovement？（）
A.Addmemory
B.Addaprocessor
C.Addafasterdisksubsystem
D.Exchangetheprocessorwithafasterprocessor
参考答案：D
