A car-rental company maintains a vehicle database for all vehicles in its current fleet. For all vehicles, it includes the vehicle identification number, license number, manufacturer, model, date of purchase, and color. Special data are included for certain types of vehicles: Trucks: cargo capacity Sports cars: horsepower, renter age requirement Vans: number of passengers Off-road vehicles: ground clearance, drivetrain (four- or two-wheel drive) Construct an ER diagram for the car rental company database.