AIX中显示系統所有的物理卷的命令是（）。 A: lsvg B: lspv C: lsgv D: lsfs

A system administrator is attempting to unmount filesystem /dev/data and receives the following message：   umount： 0506-349 Cannot unmount /dev/data： The requested resource is busy.   Which of the following commands can be used to determine which process has open references within the filesystem？（） A: lsfs B: topas C: fuser D: mount