Which of the following sets represents the domain of the function shown? {(2, 7}, (15, 13), (21, −4), (24, 18)} (5 points) {−4, 7, 13, 18} {(7, 2), (13, 15), (−4, 21), (18, 24)} {−4, 2, 7, 13, 15, 18, 21, 24} {2, 15, 21, 24}