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?()
A:The target database must be open.
B:The target database must be closed.
C:The target database must be mounted.
D:The target database must be mounted or open.
出自:Oracle认证