单项选择题
AnapplicationfailstostartafteraTechnologyLevelupgrade.TheapplicationvendorrecommendsthattwofilesetsupgradedaspartofthenewTechnologyLevelberejected.Whatistherecommendedmethodforperformingthistask?()
A.Runinstfix-utorejectthefilesets.
B.Runinstallp-rtorejectthefilesets.
C.Runinstallp-utouninstallthefilesets.
D.Restorethesystemtopreviousstatefromthesystembackup.