Which set of ordered pairs is not a function? A. (4, –2), (–2, 2), (2, –2), (4, 2) B. (–4, 2), (–2, 2), (2, 2), (4, 2) C. (–4, 2), (–2, –2), (2, 2), (4, 2) D. (–4, –2), (–2, –2), (2, 2), (4, 2)