"A bus company managing local traffic in a city has a database of bus routes, bus stops, the buses that operate on the routes, and drivers who drive the buses.

Each bus route is identified by an integer number, such as $20,32,$ and $50.$ For each route, information is also stored about a route name consisting of up to three location names, for example, 'Student Village, Moikoinen $$ Oriniemi,$\text{'}$ and the length of the route in kilometers.

For each route, the database also stores information about which bus stops are located on the route. For each bus stop, a unique ID number and an address consisting of a street name and street number are stored $($e$.$g$.,$ 'Tavast Street $3\text{'}).$ Naturally, a particular bus stop can belong to multiple routes.

For each bus, information is stored about its registration number, year model, and passenger capacity. A route can be serviced by multiple buses, but a specific bus serves only one route $($if the bus is in operation$).$

The database should store information about which buses operate on the different routes, as well as which drivers drive the buses. A driver drives at most one bus at a time, and a bus has a driver when it is in operation. For drivers, a unique ID number and names consisting of first and last names are stored. Draw up an E$-$R diagram of the operation $($e$.$g$.,$ with Draw.io$).$ What entity sets can you identify in the described business, and what type are they? What relationship sets exist, and what is their cardinality? Convert the E$-$R model to schemas