You defined the Recovery Manager （RMAN） retention policy to recovery window of 7 days by executing the following command：  RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;  When a backup is performed， what would be the status of this backup after seven days？（）

• A、The backup would be marked as invalid.
• B、The backup would be marked as obsolete.
• C、The backup would be removed from the media.
• D、The backup would be removed from the RMAN repository.