Which of the following functions has the function rule y = x + 4?

a) {(-3, 1), (0, 4), (2, 6)}
b) {(0, 2), (-2, -6), (1, 5)}
c) {(-2, 2), (-1, -5), (3, 7)}
d) {(2, 6), (-3, -7), (0, 4)}