a woman gives birth to a son who has type AB blood. She has type B blood. which of the following can be concluded from this about her parents blood type?

A.) one of her parents had at least one B allele

B.) one of her parents had type AB blood.

C.) one of her parents had type B blood and the other type A blood.

D.) one of her parents had at least one A allele and the other at least one B allele.