During loading or unloading at a dock, what is a correct driver precaution?

1. Leave the vehicle in gear and walk away with the engine at high idle
2. Stand in the path of the forklift so the loader can see you
3. Let anyone climb the load without fall protection because you are in a hurry
4. Apply the parking brake, secure the vehicle against roll-away, and stay out of the loading equipment's danger zone unless your role requires it