A rental car agency classifies the vehicles it rents into four categories: compact, mid$-$size, fullsize, and sport utility. The agency wants to record the following data for all vehicles: VID, Make, Model, Year, and Color. There are no unique attributes for any of the four classes of the vehicles. The entity type vehicle has a relationship $($named rents$)$ with a customer entity type. None of the four vehicle classes has a unique relationship with any entity type.