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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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出自：Oracle认证

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