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. estroy the physical backup files every 7 days.

D. estroy 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.