Identify the set of ordered pairs that represents y as a function of x.

{(0, 0), (1, 1), (2, 3), (3, 3)}
{(−1, 0), (1, 0), (3, 0), (3, 4)}
{(0, 0), (0, 1), (2, 3), (3, 4)}
{(1, 0), (2, 0), (3, 3), (3, 4)}