If f(x) is an even function, which statement about the graph of f(x) must be true? It has rotational symmetry about the origin. x It has line symmetry about the line y = x. O It has line symmetry about the y-axis. O It has line symmetry about the x-axis.

“ If f(x) is an even function, which statement about the graph of f(x) must be true? It has rotational symmetry about the origin. x It has line symmetry about the line y = x. O It has line symmetry about the y-axis. O It has line symmetry about the x-axis. ”