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

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

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ER Model and Business Rules
Use of a supertype/subtype relationship is necessary when which of the following exists?

An instance of a subtype participates in a relationship that is the same as the other subtypes.
An instance of a subtype participates in a relationship that is unique to that subtype.
Attributes apply to all of the instances of an entity type.
No attributes apply to any of the instances of an entity type.

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