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 issuing this command?（）

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