YoumanageseveralcomputersthatrunWindows7.Auserwantstorollbackadriver.TheuseropensthedevicepropertiesinDeviceManageranddiscoversthattheRollBackDriveroptionisunavailable.YouconnecttothecomputerbyusingWindowsRemoteAssistance.Youneedtorollbackthedrivertoitspreviousversion.Whatshouldyoudofirst?（）
A.AddtheusertothePowerUsersgroup.
B.Right-clickDeviceManagerandselectRunasadministrator.
C.FromSystemProperties，modifyDeviceInstallationSettings.
D.FromtheLocalGroupPolicy，modifyDeviceInstallationRestrictions.
参考答案：B
