4. Draw one ER model diagram (with names and multiplicities) showing three entities, Truck, Store and Driver. There are two relationships: the relationship "delivers to" between Truck and Store and the relationship "drives" between Truck and Driver. Each truck is assigned to no more than 5 stores, and each store has one designated truck. Each driver has one or none assigned truck, and a truck at different time may have different drivers. The primary key of Truck is truckNo, the primary key of Driver is driverName, and the primary key of Store is storeNo