Select all statements that correctly describe the completeness constraint in a specialization$$generalization relationship:

Group of answer choices

If a specialization$-$generalization relationship is totally complete $($mandatory$),$ then there must be at least two subtypes in the relationship

If a specialization$-$generalization relationship is partially complete $($optional$),$ then each supertype instance may not have any subtype instances

If a specialization$-$generalization relationship is totally complete $($mandatory$),$ then each supertype instance must have a subtype instance

If a specialization$-$generalization relationship is incomplete, then supertype and subtype instances are only partially relevant

The same specialization$-$generalization relationship can be both partially and totally complete