Examine the following set of RMAN commands: Which statement is true when the RMAN RUN block Is executed?（）

• A、The execution of the script fails because multiple channels cannot coexist.
• B、The script is executed and both the channels are used for the script execution.
• C、The new channel, CHI, is Ignored because a channel has been configured already.
• D、ration parameter DC1 is overridden because a new channel is allocated in RMAN RUN block.