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.
单选题
After running the CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS command， what has been accomplished？（）
A
Retain the data file backup for 7 days.
B
Run the recover process every 7 days.
C
Destroy the physical backup files every 7 days.
D
Destroy the physical backup files older than 7 days.
E
Retain one backup of each data file for at least 7 days.
F
Keep the catalog information in the control file for 7 days.
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