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

[answerhappygod]

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;