Which of the parents shown below could have a baby with blood type B+?
Four babies were born in a hospital on the same day. Due to a mix-up at the hospital, there was some confusion as to the identity of the babies.
Mother: Type A
Father: Type O
Mother: Type AB
Father: Type B
Mother: Type AB
Father: Type O
Mother: Type O
Father: Type B
Parents 1: Mother Type A, Father Type O
Parents 2: Mother Type AB, Father Type B
Parents 3: Mother Type AB, Father Type O
Parents 4: Mother Type O, Father Type B
Parents 1 and 4
Parents 2 and 4
Parents 1