（单选题）
What does it mean if a backup is expired？（）
A The backup set has exceeded the retention criteria set in RMAN and is eligible for removal.
B The backup set has one or more invalid blocks in it and is not usable for recovery.
C The backup set contains one or more tablespaces no longer in the database.
D The backup set contains one or more missing backup set pieces.
E The backup set is from a previous version of RMAN and was not upgraded.
正确答案
答案解析
略
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