Design a generalization and ndashspecialization hierarchy for motor-vehicle sales company. The company sells motorcycles passenger cars vans buses. Justify your placement of attributes at each l?

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Vehicle type | Motor vehicle | Motorcycle | Passenger car | Van | Bus

Engine type | Internal combustion | Gasoline | Gasoline | Diesel | Diesel

Number of wheels | 2 | 2 | 4 | 4 | 4 or more

Passenger capacity | 1-2 | 1-2 | 5 or more | 5-15 | 15 or more

Cargo capacity | None | None | Trunk | Cargo area | Cargo area

Purpose | Recreation | Transportation | Transportation | Commercial | Commercial

A motor vehicle is a land vehicle that is propelled by an engine. Motorcycles have two wheels and are typically used for recreation. Passenger cars have four wheels and are typically used to transport people. Vans have four wheels and have a large cargo area, making them ideal for transporting goods or people. Buses have four or more wheels and are used to transport large groups of people.