Go back to 1Z0-877 - Oracle Solaris 10 System Administrator Certified Professional Exam, Part I

Question :-

The disk slice /dev/dsk/c2t2d0s3, which has the /opt/software file system mounted, is starting to report errors that indicate it might crash soon. It is imperative that the file system is unmounted and the disk taken offline quickly. A check indicates that a number of people are accessing this file system. Which command forcibly unmounts this file system?
unmount /opt/software
umount /dev/dsk/c2t2d0s3
unmount -f /dev/dsk/c2t2d0s3
umount -f /opt/software

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