In rabbits, a dihybrid cross is performed starting with a true-breeding parental generation consisting of males with short, black hair and females with long, brown hair. All the F: generation consisted of animals that had short, black hair. If an Fy rabbit was crossed to a rabbit that had long, brown hair, what would be the expected ratio of F2 offspring in the following phenotypic categories: short & black, short & brown, long & black, and long & brown?

a. 1:1:1:1
b. 9:3:3:1
c. 3:9:3:1
d. 1:3:3:1
e. 3:3:1:1