Which statement best describes an advantage of virtual tape libraries (VTL) in comparison to disk to disk (D2D) backup solutions?

A.
Disk array does not respond to backup software command just as if it were a tape drive or tape library.

B.
Virtual type is automatically sent to off-site vault after backup finishes

C.
Existing backup applications and processes can be used with VTL

D.
Disk array works as a “temporary cache” for the backup software