Draw ER diagram for the given scenario:
Consider a bus ticketing system that records information about the passegner, bus and route. Passenger is assigned to a bus that travels to a route. A bus contains many passegners and a passegner can be assigned into only one bus. Many busses travel in same route but a bus can travel in only one route. The attributes of passegner are pid(unique), gender and phone_no(multi-values). Similarly bus contains regno(unique) and color and route contains rid(unique), distance and rate.