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

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

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

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

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