What is the purpose of the TimeFinder/Mirror Protected Restore function?

A.
Creates an additional BCV copy of the standard device for additional data protection
B.
Prevents host updates to the standard device during the restore operation to ensure data on the BCV devices is not changed during the restore operation
C.
Captures writes to the standard device so they can be applied to the BCV device at a later time
D.
Ensures data on the BCV devices is not changed during the restore operation regardless of host updates to the standard device