You run the following commands： RMAN> list expired backup； RMAN> delete expired backup； What will happen to the backup set pieces associated with the backups that appear in the list expired backup command？（）
- A They will be renamed.
- B Nothing will happen to them. The backup set pieces do not exist.
- C They will be deleted immediately since they are not in the flash recovery area.
- D You will need to manually remove the physical files listed in the output of the commands.
- E They will become hidden files and removed 10 days later.