（单选题）
If a backup is expired， which of the following is true？（）
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D The backup is no longer valid because of a resetlogs operation.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.
正确答案
答案解析
略
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