Which two factors will you consider while performing the backup operation? (Choose two)

You want to perform an RMAN backup of database as a copy. Which two factors will you consider while performing the backup operation? (Choose two).

A.
The backup as copy can only be taken to disk

B.
The backup as copy can only be taken to tape

C.
Backup can be performed only when the instance is shutdown

D.
Backup will constitute all used and unused blocks in the database