A Man with Type a Blood and a Woman with Type

A man with type A blood and a woman with type B blood have a child with type O blood.What are the genotypes of the man and woman?

A) I^A i , and I^B i
B) Both are i i
C) I^A I^A, and I^B I^B
D) I^A i, and i i
E) i i, and I^B i