A pregnant woman has an equal chance of her baby being blood group A or blood group AB. Which one of the following shows the possible genotypes of the woman and the father of her child ?
A. `I^(A)I^(A)` and `I^(B)I^(O)`
B. `I^(A)I^(B)` and `I^(B)I^(O)`
C. `I^(A)I^(O)` and `I^(B)I^(O)`
D. `I^(A)I^(B)` and `I^(A)I^(O)`
