An attribute of the supertype that determines the target subtype by its values is known as a subtype discriminator.
Therefore, the final answer is (c) subtype decision.
The subtype discriminator's goal is to assist you in avoiding the need to create subqueries or joins only to locate data, such as the names of all AARP members.
A supertype entity's subtype discriminator is an attribute that establishes which subtype the supertype incidence belongs to. Conflicting and overlapping prohibitions. A distinct portion of the supertype entity set is contained in disjoint subtypes. Only one of the subtypes may exist for each entity instance of the supertype.
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