a. (15 points) The following figure shows an ER diagram for a university dining service organization that provides dining services to a major university. Transform the ER diagram to a set of relations and develop a relational schema. Specify your relational schema verbally as in the example below. b. Specify the primary keys, foreign keys and referential integrity constraints. Example: Customer_t(CustomerID PK, Address, City, State, Zip) ORDER_t(Orderld PK, Date, CustomerID FK) CustomeriD in Order_t references CustoemriD in Customer_t Served at MENU Menu ID Mon Description Menu Type EVENT Event ID Event Date Event Location Event Time ++ Supervises Contains WORK SCHEDULE DISH Dish ID Dish Name Prep Time Start Time End Time Position STAFF Emp ID Name Salary