A system’s backups are failing. Error log analysis indicates that there is either a hardware or media problem. Which command is used to determine if there is a hardware problem with the tape drive？（）

Asystemadministratorwouldliketoverifytheuserdefinitionsinthe etc passwdfile.Whichofthefollowingcommandswillaccomplishthis？（）

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

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Asystemadministratorhasbeenaskedtolockaspecificloginaccount.Whichofthefollowingcommandsisusedtoaccomplishthis？（）

A.pwdck
B.usrck
C.chuser
D.rmuser

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