Two babies are mixed up in the hospital nursery.  The blood…

Two babies are mixed up in the hospital nursery.  The blood types of Couple #1 are A and O and the blood types of Couple #2 are AB and B.  Baby Joe has blood type O and Baby Jane has blood type A.  Who are the parents of Baby Joe and Baby Jane?   a. Baby Jane parents are Couple # _______ b. Baby Joe parents are Couple # ________