Which sequence correctly describes a standard pushback from a gate stand?

Which sequence correctly describes a standard pushback from a gate stand?

• A. Confirm pushback clearance, remove parking chocks, attach tow device as required, communicate with the flight deck, set brakes, begin pushback, monitor until clear of the stand, stop, set parking brake, disconnect tow gear, remove tow bar, and prepare for taxi.
• B. Verify pushback clearance, remove parking chocks, attach tow device, communicate with the flight deck, set brakes, start pushback, monitor until clear of the stand, and prepare for taxi.
• C. Confirm pushback clearance, remove parking chocks, begin pushback immediately, monitor until clear of the stand, then assign a taxi route.
• D. Begin pushback after obtaining verbal permission from any ground crew.

Answer: (A)