ER Model and Business Rules
Which of the following statements concerning business rules is true?

All of these
It should not be convertible to computer code.
It may include restrictions.
It should be complex.

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

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

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