Which two statements are true about the duplexing of the backups taken by RMAN?

Which two statements are true about the duplexing of the backups taken by RMAN?
(Choose two.)

Which two statements are true about the duplexing of the backups taken by RMAN?
(Choose two.)

A.
It’s only supported for the backups performed on the tape

B.
It is not supported for backup operations that produce image copies

C.
Duplex backups need a parallelism for the device to be equal to number of copies

D.
Duplex backups can be performed to either disk or tape, but cannot be performed on tape
and disk simultaneously

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Jake from SF

Jake from SF

B and D are correct:

https://docs.oracle.com/cd/E18283_01/backup.112/e10642/rcmbckad.htm

For B: Duplexing applies only to backup sets, not image copies.

For D: RMAN does not automate the splitting of mirrors, but can make use of split mirrors in backup and recovery. For example, RMAN can treat a split mirror of a datafile as a datafile copy, and can also back up this copy to disk or tape.

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