Asystemadministratorisattemptingtounmountfilesystem\/dev\/dataandreceivesthefollowingmessageumount0506-349Cannotunmount\/dev\/dataTherequestedresourceisbusy.Whichofthefollowingcommandscanbeusedtodeterminewhichprocesshasopenreferenceswithinthefilesystem？（）
A.lsfs
B.topas
C.fuser
D.mount
参考答案：C
