（单选题）
You executed the following command in Recovery Manager （RMAN）： RMAN> REPORT NEED BACKUP days 3； What is the output of this command？（）
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
正确答案
答案解析
略
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