What is the result of this command？（） RMAN> Report need backup days 3；

• A、 Lists all datafiles created in the last three days that are not backed up.
• B、 Lists all datafiles not recoverable based on the current retention criteria.
• C、 Lists all datafiles not backed up in the last three days. The datafile is not recoverable. 
• D、 Lists all datafiles that need to be backed up due to unrecoverable operations.
• E、 Lists all datafiles not backed up in the last three days. It does not imply that the datafile is not recoverable.