Situation: The New Branch School District operates a fleet of 40 buses that serve approximately 1,000 students in grades K12. The bus operation involves 30 regular routes, plus special routes for activities, athletic events, and summer sessions. The district employs 12 full-time drivers and 25 to 30 part-time drivers. A dispatcher coordinates the staffing and routes and relays messages to drivers regarding students and parents who call about pickup and drop-off arrangements.

1. Identify possible actors and use cases involved in school bus operations.
2. Create a use case diagram for the school bus system.
3. Create a sequence diagram for the use case you selected.
4. Create a state transition diagram that describes typical student states and how they change based on specific actions and events.