Q7.41. A data model has been defined with a vehicle entity called “Vehicle.” Two subtypes are defined: “Car” and “Truck.” Which statement is true?

(a) “Car” and “Truck” will inherit all attributes and relationships from

“Vehicle.”

(b) “Car” and “Truck” must have their own attributes.

(c) “Car” and “Truck” will inherit all mandatory attributes and relationships, but not the optional ones.

(d) “Vehicle” will be a sum of all the attributes from “Car” and “Truck.”