You issue the following RMAN command to set a retention policy on a database： RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 2； What will be the outcome of the above command？（）

After two days， the backup will be marked obsolete.
B. After two days， the backup will be deleted from the media.
C. If the RMAN repository has records of two or more recent backups of a file， then the older backup will be deleted from the media.
D. If the RMAN repository has records of two or more recent backups of a file， then the older backup will be marked obsolete.