Determine which relation is a function.

graph with points plotted at (negative 3, negative 1), (negative 4, 3), (negative 2, negative 2), (negative 1, 0), (2, 0), and (3, 2).

coordinate gridgraph with points plotted at (negative 2, 1), (negative 1, 3), (0, 2), (0, negative 1), (1, 3), and (2, 1).

graph with points plotted at (negative 4, 3), (negative 2, 1), (negative 1, 3), (negative 1, negative 1), (1, 1), and (2, negative 1).

graph with points plotted at (negative 2, 1), (negative 2, negative 2), (negative 1, 3), (0, 1), (2, 0), and (2, negative 2).