A dihybrid cross experiment is carried out on pocket mice. The traits being observed are fur color and tail length. In the F2 generation, 54 mice are dark brown with long tails, 18 mice are dark brown with short tails, 18 mice are tan with long tails, and 6 mice are tan with short tails. Which traits are dominant?

tan fur, long tail

tan fur, short tail

dark brown fur, short tail

dark brown fur, long tail