（单选题）
You executed the following command in Recovery Manager （RMAN）： RMAN> RESTORE CONTROLFILE； Which operation must you perform before this command is executed？（）
Aback up the control file to trace
Bbring database to the MOUNT state
Copen a connection to the RMAN recovery catalog， which contains the RMAN metadata for the target database
Dset the database ID （DBID）， but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog
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答案解析
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