单项选择题
A.chgrp
B.chuser
C.setgroups
D.edit /etc/security/group
单项选择题 Duetooperationalcommitments，asystemhasaveryshortbackupwindowduringtheweek，butisnotusedfromSaturdaymorningthroughSundayatMidnight.Whichofthefollowingminimizesbackuptime，whileprovidingthebestdatarestorecoverage？（）
单项选择题 AsystemadministratorperformsafullbackupeverySaturdayeveningandincrementalbackupstherestoftheweek.ThesystemfailedonThursdayandneedstoberestored.Whichbackuptapeswillberequiredtorestorethesystemtoitsmostrecentrecoverablestate？（）
单项选择题 Asystemadministratorusedthesavevgcommandtobackupthetestvgeachnight.Thereisnowarequirementtoexcludethe/test/staticfilesystemfromthebackup.Howcanthisbeaccomplished？（）