You executed the following command in the Recovery Manager (RMAN): RMAN> REPORT NEED BACKUP days 3; What is the output of this command?（）

A list of files that require a backup within 3 days
B. A list of files requiring more than 3 days of archivelogs 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 as 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