Discussion
Overlapping and disjoint subtypes have different approaches on how the subtype discriminator is applied.
Answer: A
Correct answer: True
With disjoint subtypes a single-valued discriminator suffices, since each instance belongs to exactly one. With overlapping subtypes an instance may belong to several, so the discriminator becomes a composite of boolean attributes, one for each subtype, each answering whether this instance is of that kind.
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