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.
No attributes apply to any of the instances of an entity type.
Attributes apply to all of the instances of an entity type.

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

Attributes are assigned at the highest logical level.
Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.
Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.
Attributes are assigned at the lowest logical level.

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