You have enabled backup optimization in RMAN. You issue the following RMAN command to configure a redundancy-based retention policy: CONFIGURE RETENTION POLICY TO REDUNDANCY 3; Which statement is true?（）
- A The command fails because you cannot configure a redundancy-based retention policy when backup optimization is enabled
- B Backup optimization is performed, but RMAN considers the redundancy-based retention policy when it determines which datafiles should be backed up
- C Backup optimization is permanently disabled
- D Backup optimization is temporarily disabled because a redundancy-based retention policy is specified