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單項選擇題

You executed the following command in Recovery Manager (RMAN) against your Oracle 10g database: 
RMAN> REPORT NEED BACKUP days 3; 
What would be the output of this command?() 

A.a list of files that require a backup within three days
B.a list of files that have not been backed up for three days
C.a list of files that RMAN recommends be backed up only once in every three days, based on low volatility
D.a list of files for which a backup has already been performed and may need a backup after three days

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