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For total and overlapping constraint, which of the following statements is not correct? Group of answer choices subtype sets are not unique. subtype discriminators can

For total and overlapping constraint, which of the following statements is not correct?
Group of answer choices
subtype sets are not unique.
subtype discriminators can not be null.
Every supertype occurrence is a member of at least one subtype.
Implementation is based on the value of the single-attribute subtype discriminator.

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