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Asystemadministratorisattemptingtounmountfilesystem/dev/dataandreceivesthefollowingmessage:umount:0506-349Cannotunmount/dev/data:Therequestedresourceisbusy.Whichofthefollowingcommandscanbeusedtodeterminewhichprocesshasopenreferenceswithinthefilesystem?()
A.lsfs
B.topas
C.fuser
D.mount
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