OCP CBT Question 512

Please solve the following question.

You are managing an Oracle database and have configured multiple DISK channels for RMAN backups to improve performance. You want to ensure that RMAN uses at least 4 channels for database backups and that backup pieces are spread across different mount points for redundancy.Examine the RMAN commands. Which configuration fulfills these requirements?

sqlCONFIGURE DEVICE TYPE DISK PARALLELISM 4 BACKUP TYPE TO BACKUPSET;

sqlCONFIGURE DEFAULT DEVICE TYPE TO DISK;CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '/u01/backup/%U', '/u02/backup/%U', '/u03/backup/%U', '/u04/backup/%U';

sqlCONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT '/u01/backup/%U';CONFIGURE CHANNEL 2 DEVICE TYPE DISK FORMAT '/u02/backup/%U';CONFIGURE CHANNEL 3 DEVICE TYPE DISK FORMAT '/u03/backup/%U';CONFIGURE CHANNEL 4 DEVICE TYPE DISK FORMAT '/u04/backup/%U';

sqlCONFIGURE DEVICE TYPE DISK PARALLELISM 4;CONFIGURE BACKUP OPTIMIZATION ON;