What is the duty of a school bus driver regarding supervising children boarding and crossing the street after disembarking?

1. Drive away immediately as soon as the student steps onto the pavement
2. Activate hazard lights, ensure the vehicle is safely stopped, supervise the child's descent to the sidewalk, and ensure they do not cross the street from behind the bus into blind traffic
3. Instruct children to run across multi-lane avenues quickly
4. Honk the horn continuously while students board