In this question, you need to design an ER diagram for a company that sells cars. We make the following assumptions: The company owns multiple shops that customers can visit to buy cars, and each shop has a unique address, and a phone number. For each employee of the company, we want to store the unique SSN, the name, and the hiring date. Each employee has a fixed shop at which he/she works. Each shop is managed by exactly one employee who serves as the shop manager. An employee can be the manager of at most one shop. For each car, we want to keep track of the unique license number, the year, and the model. Each car belongs to exactly one shop. We also keep track of the customers, where, for each customer, we store a unique email address and a name. When a customer buys a car, we keep track of the date of the sale and the employee who was serving the customer