Which option protects expired backup sets on disk cartridges from being deleted as soon as the cartridges are inserted into the device?

A.
Require media password before deleting expired backup sets

B.
Allow Backup Exec to delete all expired backup sets

C.
Limit Backup Exec to read-only operations on a disk cartridge if it has not been inserted for 30 days

D.
Automatically retain all backup sets on disk cartridges when they are inserted