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单选题
You want to create the Recovery Manager (RMAN) Virtual Private Catalog (VPC) to maintain a separation of responsibilities along with a consolidation of RMAN repository.  Which condition must be met before you create the VPC?()
A

 A base catalog exists

B

 The recovery catalog is empty

C

 The base recovery catalog must be dropped

D

 A target database is registered in the recovery catalog


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