Which statement about using RMAN stored scripts is true？（）  

A、 To create and execute an RMAN stored script，you must use a recovery catalog.

B、 When executing a stored script and a command fails，the remainder of the script is executed，and a message is written to the alert log file.

C、 RMAN stored scripts can always be executed against any target database that is registered in the recovery catalog.

D、 When you execute a stored script，it always executes using the persistent channel settings previously set with the CONFIGURE command.