单选题
If a backup is expired， which of the following is true？（）
发布日期：2021-11-18
A
It can never be used for a restore/recover operation.
B
Oracle will remove the backup set pieces from the flash recovery area.
C
The backup has been used at least once to restore and recover the database.
D
The backup is no longer valid because of a resetlogs operation.
E
The physical backup set pieces are missing from the media.
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