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The incomplete coverage constraint for a generalization relationship means that:A. a superclass instance can be a member of one or more of the subclasses. [overlapping]B. some subclass instance is not a member of any superclass. [not possible]C. a superclass instance can be a member of at most one of the subclasses. [disjoint]D. each superclass instance is a member of some subclass. [complete]E. some superclass instance is not a member of any subclass.
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