Refer to the relational schema below, answer the following q…

Refer to the relational schema below, answer the following questions: CarRental(RentalID, CarID, CustomerID, RentalDate, ReturnDate, CustomerName, CarModel, RentalCost)   This table has the set of functional dependencies: {CustomerID} –> CustomerName{CarID} –> CarModel{RentalID} –> CarID, CustomerID, RentalDate, ReturnDate{CarID, RentalDate} –> RentalCost What is the primary key of table CarRental?