Question: Subtypes should be used when _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Subtypes should be used when _______________________.
None of the above.
there are attributes that apply to some, but not all instances of an entity type.
the instances of a subtype do not participate in a relationship that is unique to that subtype.
supertypes relate to objects outside the business.
Which of the following is true?
None of the above
Optional attributes present an opportunities to incorporate super type and subtype relationship in a database conceptual design.
Entities that participate in a 1-to-1 binary relationship must be combined into one entity.
Subtype discriminator can sometimes be omitted.

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