Aconsultanthasbeenaskedtodoaperformanceanalysisonadatabaseserver.Whichsubsystemshouldtheconsultantfirstanalyzeandwhy?()

A.CPU，becausethedatabasereplicationprocessrequiresaconsiderableamountofCPUtime

B.Memory，becausethebuffercacherequiresalargeamountofmemorytomaintainthedatainsystemmemory

C.Disk，becauseitisimportanttoconfigureasufficientnumberofdiskstomatchtheCPUprocessingpower

D.Network，becausethedatareturnedtotheclientfromtheservercanbealargesubsetofthetotaldatabase