ER Model and Business Rules
Specialization is which of the following processes?

Defining one or more subtypes of the supertype and not forming supertype/subtype relationships.
Defining one or more supertypes of the subtype and forming supertype/subtype relationships.
Defining one or more supertypes of the subtype and not forming supertype/subtype relationships.
Defining one or more subtypes of the supertype and forming supertype/subtype relationships.

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