Which relation is a function? Graph with 5 points plotted at (negative 1, 0), (negative 1, 1), (negative 1, 3), (1, 0), and (4, 0). Graph with 5 points plotted at (negative 3, negative 1), (negative 2, 1), (2, negative 1), (4, 3), and (4, negative 3). Graph with 5 points plotted at (negative 1, negative 3), (0, 0), (1, 2), (1, 3), and (2, 2). Graph with 5 points plotted at (negative 3, 2), (negative 2, negative 1), (negative 1, 1), (0, negative 3), and (4, 1).