A customer installed OS X Mountain Lion on his Mac Pro (Mid 2012) on a RAID Volume, but cannot enable FileVault 2. What is a likely cause of this issue?

A.
The Mac Pro does not have sufficient RAM.

B.
The hard disks do not have the correct partition scheme.

C.
FileVault 2 was not selected as a custom option during the OS X Mountain Lion install.

D.
The customer continued the install of OS X Mountain Lion, despite a warning that OS X Recovery Mode and FileVault would not be available on this disk.