Which area is specifically prohibited for vehicle parking before aircraft arrival?

The correct choice highlights the importance of maintaining safety and efficiency around aircraft operations. The aircraft safety envelope refers to the space around an aircraft that must remain clear of obstacles, including parked vehicles, personnel, and equipment, to ensure safe movement during arrival and departure.

This area is critical because it is designed to provide sufficient space for ground services, including the approach and departure of the aircraft. Vehicles parked in this zone can pose significant hazards, such as obstructing ground crew activities or impeding emergency responses if necessary. Additionally, keeping this area clear allows for the safe maneuvering of the aircraft and minimizes the risk of accidents.

The other areas mentioned may have specific rules regarding parking, but they do not carry the same level of strict prohibition as the aircraft safety envelope, where safety must be the utmost priority to protect lives and property during ground operations.