Examine this statement：&ens

Examine this statement：  RMAN >BACKUP FORMAT ’/BACKUP/df_%d_%s_%p.bus1 DATABASE filesperset = 2；  What state must the target database be in for you to use this RMAN command？（）

• AThe target database must be open.
• BThe target database must be closed.
• CThe target database must be mounted.
• DThe target database must be mounted or open.