What is the statutory rule regarding passengers standing in the driver's forward field of view in a public transport bus (Category D)?

1. Passengers are strictly forbidden from standing forward of the designated safety barrier line or obstructing the driver's mirrors and sightlines
2. Passengers may sit on the engine cover next to the gear lever
3. Standing passengers may hold onto the steering wheel for balance
4. Up to 10 passengers may stand directly in front of the front windshield