Whileattemptingtoexpandafilesystem，anadministratorreceivesanerrormessageindicatingthatthefilesystemisnotrecognized.Runningthe’lsfs’commandfailstodisplayanyoutput，butthe’df’commandisworkinganddisplaysnormalfilesystems.Whatisthelikelycauseoftheproblem？（）

A.The/etc/filesystemsfileismissing.

B.The/dev/hd8logicalvolumeiscorrupt.

C.Thehostingvolumegroupisnotvariedon.

D.The/varand/tmpfilesystemsmaybefull.