A system administrator has placed an AIX base media CD-ROM in a server and initiated a reboot. The server has an ascii terminal attached to it. Which key or key combination must the administrator press to initiate the maintenance mode？（）

单项选择题Amirroredrootdiskneedstobereplaced.Whichofthefollowingcommandswillclearthebootrecordonthefailingdisk？（）

A.chpv -c
B.rmlv hd5
C.bosboot -ad
D.rmdev -dl hd5

单项选择题Asystemadministratorhasdeterminedarootmirroreddisk，hdisk1，needstobereplaced.Therootvolumehasbeenunmirrored.Whatisthenextsteptoremovethediskdrive？（）

A.cfgmgr
B.rmdev -d hdisk1 -l
C.reducevg rootvg hdisk1
D.have the IBM CE replace the disk

单项选择题Followingasystemboot，thedisplayindicatesthatpreviouslydetectedhardwareismissing.Whatcommandshouldbeusedtoidentifythemissinghardware？（）

A.diag
B.lscfg
C.cfgmgr
D.lsattr

单项选择题Asystem’sbackupsarefailing.Errorloganalysisindicatesthatthereiseitherahardwareormediaproblem.Whichcommandisusedtodetermineifthereisahardwareproblemwiththetapedrive？（）

A.diag
B.lscfg
C.lsdev
D.cfgmgr

单项选择题Asystemadministratorwouldliketoverifytheuserdefinitionsinthe etc passwdfile.Whichofthefollowingcommandswillaccomplishthis？（）

A.usrck
B.sysck
C.lssec
D.lsuser