A classmate states that if s = {(3, 1), (2, 1), (4, 3), (5, 4)}, then the inverse of s = {(1, 3), (2, 1), (3, 4), (4, 5)} and is also a function. Which is the classmate's error? A. The classmate correctly identified the inverse of s but it is not a function. B. The classmate did not reverse the coordinates of (2, 1), so the inverse of s is wrong but it is still a function. C. The classmate did not reverse the coordinates of (2, 1), so the inverse of s is wrong and it is not a function. D. The classmate should not have reversed any of the coordinates, but the inverse of s is still a function.