If y = 6x – 4, which of the following sets represents possible inputs and outputs of the function, represented as ordered pairs? a) {(0, –4), (1, 2), (3, 14)} b) {(5, 20), (2, 10), (–1, –3)} c) {(–3, –15), (6, 25), (3, 5)} d) {(4, 18), (0, 10), (0, –2)}