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Which of the following is a specialization hierarchy disjoint constraint scenario in case of partial completeness? Subtype discriminator cannot be null. Subtype discriminator can be

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

Subtype discriminator cannot be null.

Subtype discriminator can be null.

Each supertype occurrence is a member of only one subtype.

Each supertype occurrence is a member of at least one subtype.

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