What are three purposes of the R

What are three purposes of the RMAN “FROM” clause?（）

A、to support PUSH-based active database duplication
B、to support synchronization of a standby database with the primary database in a Data environment
C、To support PULL-based active database duplication
D、To support file restores over the network in a Data Guard environment
E、To support file recovery over the network in a Data Guard environment

正确答案:B,C,E

答案解析:有

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