Which marshalling signals convey 'stop' and 'go' during pushback?

• A. A raised hand with palm forward to stop; an extended arm and clear motion away from the body to indicate go, with additional hand gestures as needed to steer.
• B. A closed fist held up to stop; a thumbs-up to go
• C. A two-finger point toward the vehicle to stop; a wave to go
• D. Waving both arms overhead to stop; crossing arms to go

Answer: (A)