单选题

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.

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