（单选题）
After running the CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS command， what has been accomplished？（）
ARetain the data file backup for 7 days.
BRun the recover process every 7 days.
CDestroy the physical backup files every 7 days.
DDestroy the physical backup files older than 7 days.
ERetain one backup of each data file for at least 7 days.
FKeep the catalog information in the control file for 7 days.
正确答案
答案解析
略
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