For M-3 equipment, what is the reasoning behind preferring the EP cutout method?

The EP cutout method is preferred for M-3 equipment primarily because it does not deactivate the emergency brake. Keeping the emergency brake in an active state is crucial for maintaining safety in the event of a sudden stop or an emergency situation. This method allows operators to isolate or cut out certain systems while ensuring that the emergency braking capabilities remain intact, which is essential for the protection of passengers and crew.

The other options, while potentially valid in other contexts, do not address the primary safety concern that the EP cutout method effectively manages. The main goal of this approach is to enhance operational safety, ensuring that emergency systems are preserved and ready for use if needed.