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What does the output on this report indicate？（）   RMAN> report need backup；  RMAN retention policy will be applied to the command  RMAN retention policy is set to redundancy 1  Report of files with less than 1 redundant backups  File #bkps Name  5 0 C:///ORACLE/ORADATA/ORCL/MY_DATA_01.DBF  
A: The my_data_01.dbf datafile is corrupted and needs to be restored.
B: The my_data_01.dbf datafile has not yet been backed up. This report does not imply that the data in the datafile can not be recovered.
C: The my_data_01.dbf datafile has not yet been backed up. This report implies that the data in the datafile can not be recovered.
D: The my_data_01.dbf datafile no longer meets the retention criteria for backups.
E: Datafile 5 is missing.

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出自：Oracle认证

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