In RMAN, you execute the command CONFIGURE BACKUP OPTIMIZATION ON so that you can avoid backing up objects that are already backed up sufficiently within the retention policy. However, you want to make an additional backup of the USERS tablespace to a removable disk for offsite storage. How can you ensure that RMAN does not skip the backup of the USERS tablespace? (Choose the best answer.)

Answer: D

Explanation: D is correct. If you have backup optimization on, RMAN will unconditionally back up the object if you use the FORCE option. A is incorrect because this is not the best way to accomplish this task. B is incorrect because no such RMAN keyword UNCONDITIONAL exists. C is incorrect because the conditions for backup optimization may already be met on all device types.