（单选题）
Why would you execute the report obsolete command？（）
A To list all backups that were no longer available for restore operations
B To list all backups that had aged beyond the RMAN retention criteria
C To list all backup set pieces listed in control-file or recovery-catalog metadata that are not on the backup media
D To list all datafiles that are no longer part of the database and thus do not need to be backed up
E To list all archived redo logs that are no longer needed for any database recovery
正确答案
答案解析
略
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