Select all statements that correctly describe the completeness constraint in a specializationgeneralization relationship:

It a specialization$-$generalization relationship is partially complete optional, then each supertype instance may not have

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

suoryde instance

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

$*$ 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 incomplete, then supertype and subtype instances are only partially relevant