ER Model and Business Rules
Inheritance is which of the following?

When a subtype entity inherits values of the supertype attribute
When a subtype entity inherits values of another subtype attribute
When a supertype entity inherits values of the subtype attribute
When a supertype entity inherits values of another supertype attribute

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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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