What is the range of the relation below?

{(-4,1); (-2, 0); (8, -1)} Select the correct answer from the following.
a) {-1, 1}
b) {-1, 0, 1}
c) {-4, -2, 8}
d) {-4, -2, -1, 0, 1, 8}

b) {-1, 0, 1}