A rental car agency classifies the vehicles it rents into four categories: compact, midsize, full size, and sport utility. The agency wants to record the following data for all vehicles: Vehicle ID, Make, Model, Year, and Color. There are no unique attributes for any of the four classes of vehicle. 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 an entity type. Would you consider creating a supertype/ subtype relationship for this problem? Why or why not?
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