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Which of the following is a specialization hierarchy overlapping constraint scenario in case of partial completeness? Subtype sets are unique. Supertype has optional subtypes. Subtype

Which of the following is a specialization hierarchy overlapping constraint scenario in case of partial completeness?

Subtype sets are unique.

Supertype has optional subtypes.

Subtype discriminators cannot be null.

Subtype does not have a supertype.

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