单选题
A a list of files that require a backup within three days
B a list of files requiring more than 3 days of archive logs to apply
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 in the last three days and which is required to be backed up again based on the high number of transactions performed on them
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