（单选题）
If a backup set is expired， what can you do to correct the problem？（）
A Change the retention criteria.
B Make the lost backup set pieces available to RMAN again.
C Run the crosscheck command to correct the location for the backup set piece contained in the metadata.
D Nothing. The backup set piece is lost forever.
E Call Oracle support，their assistance is required.
正确答案
答案解析
略
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