Gina wants one kind of yogurt and one kind of topping. she can choose lemon, lime or vanilla yogurt. for the toppings, she can choose berries, granola, nuts or peaches. explain how gina can find the number of possible combinations

Which function has an inverse that is also a function? a.{(-4,3), (-2, 7), (-1,0), (4, -3), (11, -7)} b.{(-4, 6), (-2, 2), (-1, 6), (4,2), (11, 2)} c.{(-4,5), (-2, 9), (-1,8), (4, 8), (11,4)} d.{(-4,4), (-2, -1), (-1,0), (4, 1), (11, 1)}