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What is the end result of these commands if they are successful？（）   RMAN> show retention policy；  RMAN configuration parameters for database with db_unique_name  ORCL are： CONFIGURE RETENTION POLICY TO REDUNDANCY 1； # default Backup database tag=gold_copy plus archivelog tag=gold_copy delete input； Backup  database tag=silver_copy plus archivelog tag=silver_copy delete input；  
A: Attempting to restore silver_copy will fail.
B: Attempting to restore gold_copy will fail.
C: Both backups will be available for restore without question.
D: Attempting to restore gold_copy may or may not succeed.
E: You will not be able to restore either gold_copy or silver_copy.

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出自：Oracle认证

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