Discussion
When an entity instance must be a member of only one subtype, it is which of the following?
Answer: A
Correct answer: Disjoint with total specialization
Two rules are being stated at once. Must be a member makes the specialisation total, so no supertype instance sits outside the subtypes. Only one makes it disjoint, so the subtypes do not overlap. Each rule is independent of the other, which is why all four combinations of them exist.
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