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 existsB The recovery catalog is emptyC The base recovery catalog must be droppedD A target database is registered in the recovery catalog
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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