Let A be the set {1, 2, 3, 4}. Which ordered pairs are in the relation R = {(a, b); a divides b}?
1
{(1, 1), (1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 3),(4, 4)}
2
{(1,1), (1, 2), (1, 3), (1, 4), (2, 2), (2, 3), (3, 1),(4, 4)}
3
{(1, 1), (1, 2), (1, 3),(1, 4), (2, 2), (2, 4), (3, 3), (4, 4)}
4
{(1, 1), (1, 2), (1, 3), (1, 4), (2, 2), (2, 3), (3, 3) (4, 4)}