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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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