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

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

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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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