Asystemadministratorisattemptingtounmountfilesystem/dev/dataandreceivesthefollowingmessage：umount：0506-349Cannotunmount/dev/data：Therequestedresourceisbusy.Whichofthefollowingcommandscanbeusedtodeterminewhichprocesshasopenreferenceswithinthefilesystem？（）A.lsfsB.topasC.fuserD.mount

Asystemadministratorisattemptingtounmountfilesystem/dev/dataandreceivesthefollowingmessage：umount：0506-349Cannotunmount/dev/data：Therequestedresourceisbusy.Whichofthefollowingcommandscanbeusedtodeterminewhichprocesshasopenreferenceswithinthefilesystem？（）

A.lsfs

B.topas

C.fuser

D.mount

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