What must you set using the RMAN configure command to a…

You want RMAN to make duplicate copies of data files when using the backup command.
What must you set using the RMAN configure command to achieve this?

A.
MAXSETSIZE TO 2;

B.
DEVICE TYPE DISK PARALLELISM 2 BACKUP TYPE TO BACKUPSET;

C.
CHANNEL DEVICE TYPE DISK FORMAT ‘/disk1/%U’ , ‘/disk2/%U’;

D.
DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2;