Which one is TRUE in the following descriptions about the ignition system of CFM56-3 engine? ( )

A、Do not apply grease to the threads on the ignition lead end of the igniter plug.

B、Only need one gasket controls the depth the igniter plugs go into the combustion chamber.
C、The Low-energy exciter output is 1 spark per second, 1 joules per spark.
D、There is no need to provide cooling air around the ignition leads to decrease temperature