• • • • • . • Draw an ERD for a car dealership base on the business rules below. The dealership sells both new and used cars, and it operates a service facility. List the entities with their attributes such as PK and FK plus other common attributes that should belong to the entities in your ERD. Business Rules A salesperson may sell many cars, but each car is sold by only one salesperson. A customer may buy many cars, but each car is bought by only one customer. A salesperson writes a single invoice for each car he or she sells. A customer gets an invoice for each car he or she buys. A customer may come in just to have his or her car serviced; that is, a customer need not buy a car to be classified as a customer. When a customer takes one or more cars in for repair or service, one service ticket is written for each car The car dealership maintains a service history for each of the cars serviced. The service records are referenced by the car's serial number. A car brought in for service can be worked on by many mechanics, and each mechanic may work on many cars. • A car that is serviced may or may not need parts (e.g., adjusting a carburetor or cleaning a fuel injector nozzle does not require providing new parts).