Which of these sets of ordered pairs represents a function?
{(1,2),(1,3),(2,4)}\{(1, 2), (1, 3), (2, 4)\}{(1,2),(1,3),(2,4)}
{(1,2),(2,2),(3,2)}\{(1, 2), (2, 2), (3, 2)\}{(1,2),(2,2),(3,2)}
{(2,1),(2,3),(3,4)}\{(2, 1), (2, 3), (3, 4)\}{(2,1),(2,3),(3,4)}
{(0,1),(0,2),(0,3)}\{(0, 1), (0, 2), (0, 3)\}{(0,1),(0,2),(0,3)}