Whileusingthesmitinstall_removemenustoremovesomefilesetsonanAIX5.3server，asystemadministratornoticesthe\/usrfilesystemisnowunnecessarilylarge.Whichofthefollowingactionswillreducethesizeofthe\/usrfilesystem（）
A.Backup，unmount，remove，recreateandrestorethefilesystem.
B.BootfrommksysbtapeandselectShrinkfilesystemsonrestore.
C.Unmount，rundefragfs\/usrandthereducefs-sizen\/usrcommands.
D.Updatethe\/image.datafilewiththedesiredsizefor\/usrandrebootthesystem.
参考答案：B
