Two women have given birth to girls in the same hospital at the same time. The nurses think they may have accidentally switched the babies’ name tags and given the babies to the wrong parents. One baby, Jane, has type O blood and the other baby, Mary, has type A blood. The father in one set of parents, the Browns, has type A blood while the mother has type B. The father in the other set of parents, the Greens, has type AB blood while the mother has type O. What are the genotypes of the parents?