A Baby Is Born with Blood Type AB

A baby is born with blood type AB.The father is type A,and the mother is type B.The father asks why the baby has a blood type different from those of his parents.The nurse's answer should be based on the knowledge that

A) both A and B blood types are dominant.
B) the baby has a mutation of the parents' blood types.
C) type A is recessive and links more easily with type B.
D) types A and B are recessive when linked together.

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