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You are managing the APPPROD database as a DBA. You plan to duplicate this database in the same system with the name DUPDB. You issued the following RMAN commands to create a duplicate database: Which three are the prerequisites for the successful execution of the above command?（）
A:The source database should be open
B:The target database should be in ARCHIVELOG mode if it is open
C:RMAN should be connected to both the instances as SYSDBA
D:The target database backups should be copied to the source database backup directories
E:The password file must exist for the source database and have the same SYS user password as the target

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出自：Oracle认证

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