A man is married to a woman whose blood group is different from his own. They have two children. The children each have a blood group that is different from one another and also different from both parents. Determine the genotypes of the parents’ blood groups.
- A$I^A I^A$ and $I^A I^B$
- B$I^A I^A$ and $I^O I^O$
- C$I^A I^B$ and $I^B I^B$
- D$I^A I^B$ and $I^O I^O$