ER Model and Business Rules
A supertype/subtype hierarchy is which of the following?

Each supertype has only one attribute.
Each subtype has only one attribute.
Each subtype has only one supertype.
Each supertype has only one subtype.

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

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