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ASystempadministratorisreviewingroot’scommandhistoryonadevelopmentserverandfindsthatajunioradminstratorhadbeenattemptingtocorrectafullfilesystem.Oneofthefollowingcommandscauseddamagethatmustbecorrected.Whichcommandwasit（）
A.rm/var/preserve/*
B.cat/dev/null>/var/adm/cron/log
C.>/var/adm/wtmp
D.rm/var/adm/ras/errlog
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