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Examine the following RMAN command：   RMAN> CONFIGURE ENCRYPTION FOR DATABASE ON； RMAN> BACKUP DATABASE PLUS ARCHIVELOG；   Which prerequisite must be met before accomplishing the backup？（）
A: Provide a password for the encryption
B: Set up an Oracle wallet for the encryption
C: No setup is required as it is a default encryption method
D: Both Oracle wallet and password must be set up for the encryption

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出自：Oracle认证

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