9- Consider the following relations for a database that keeps track of auto sales in a car dealership (OPTION refers to some optional equipment installed on an auto ): CAR(Serial_no, Model, Manufacturer, Price) OPTION(Serial_no, Option_name, Price) SALE(Salesperson_id, Serial_no, Date, Sale_Price) SALESPERSON(Salesperson_id, Name, Phone) First, specify the foreign keys for this schema, stating any assumptions you make. Next, populate the relations with a few example tuples, and then give an example of an insertion in the SALE and SALEPERSON relations that violates the referential integrity constraints and of another insertion that does not.