Question: Which of the following statement is correct based on the letter A on the diagram? AA a . Subtype discriminator cannot be null. b .

Which of the following statement is correct based on the letter A on the diagram?
AA
a.
Subtype discriminator cannot be null.
b.
Subtype sets are unique.
c.
Every supertype occurrence is a memberof only one subtype.
d.
Subtype discriminator can be null.

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