The function f(x) is shown on the graph. On a coordinate plane, a curved line with 3 arcs, labeled f of x, crosses the x-axis at (negative 2, 0), (1, 0), and (3, 0), and the y-axis at (0, negative 6). If f(x) = 0, what is x? 0 only –6 only –2, 1, or 3 only –6, –2, 1, or 3 only