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You want to create a duplicate database DUP_DB from your production database PROD on the same host. The PROD database uses Automatic Storage Management (ASM) for storage.

Regular backups are taken using RMAN connected to a recovery catalog. You create an auxiliary instance and want to execute the command:

RMAN> DUPLICATE TARGET DATABASE TO dup_db

FROM ACTIVE DATABASE;

What is a prerequisite for the successful execution of this command

A) RMAN must be connected to the target database instance and the auxiliary instance.

B) A most recent backup set of the PROD database must exist.

C) Flashback must be enabled for the PROD database.

D) The target database must be in MOUNT state.

source : cuug