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

AIt's only supported for the backups performed on the tape

BIt is not supported for backup operations that produce image copies

CDuplex backups need a parallelism for the device to be equal to number of copies

DDuplex backups can be performed to either disk or tape, but cannot be performed on tape and disk simultaneously