Let R and S be relations defined on the set {2, 1, 4, 8}. R = {(4, 1), (8, 1), (2, 2), (1, 1)}. S = {(1, 2), (4, 1), (2, 2), (2, 4)}. What is the result of the composition R ∘ S?
a) {(1, 1), (4, 2), (2, 1), (2, 4)}
b) {(2, 2), (1, 4)}
c) {(1, 2), (4, 4), (2, 1), (2, 4)}
d) {(4, 2), (8, 4), (2, 1), (1, 2)}