An administrator would like to prevent data recovery software from retrieving any files from a deleted user. Which option is the most efficient choice?

A.
Turn on FileVault 2, wait for encryption to finish, then delete the user.

B.
Save the deleted user in a disk image, then use the Terminal to secure delete the image.

C.
Delete the user using the “Delete the home folder” with the erase home folder securely option enabled.

D.
Startup in OS X Recovery then open the Disk Utility. Choose the startup volume and erase the entire volume using a security option the writes zeros across the
entire volume.