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單項(xiàng)選擇題

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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