Which of the following utilities are used to choose which programs run at startup？ （）

单项选择题TheCHKDSK Rcommandallowsatechnicianto：（）

A.perform an exhaustive disk check， locate bad sectors， and recover readable information.
B.set a disk as read-only， perform an exhaustive disk check and repair bad sectors.
C.scan and verify the versions of all protected system files using the tools default operation.
D.consolidate fragmented files and folders on the computers hard disk.

单项选择题WhichofthefollowingwouldbethecorrectlocationtoaccesswhenenablingDriverSignatureVerification？（）

A.On the hardware tab in System Properties.
B.In the Security Center applet in Control Panel.
C.In Device Manager under the File menu and options.
D.In Computer Management.

单项选择题AuserwantstoupgradetoWindows2000.WhichofthefollowingWINNT32commandswitchescanberuntodeterminewhethertheuserscomputerandsoftwareiscompatiblewiththenewoperatingsystem？（）

A.CMDCOMS
B.CHECKUPGRADEONLY
C.COPYSOURCE
D.DUPREPARE

单项选择题Auserreportsthatthecomputerisrunningslowly.AfterrunningtheSFC，atechnicianobservesthatthedllcachefolderhasbecomecorrupted.Whichofthefollowingutilitiescanberuntorepairthecontentsofthedllcachedirectory？（）

A.FORMAT
B.SFC
C.HyperTerminal
D.DEFRAG

单项选择题AusersuspectsthatarecentlyinstalledprogramoverwroteaWindowssystemfileonthecomputer.Whichofthefollowingcommandscouldberuntocheckandverifythesystemfiles？（）

A.system /v
B.winnt /s
C.sfc /scannow
D.chkdsk /f