Given that the polynomial f(x) has degree 9, which of the following most accurately describes the number of turning points of f(x)? Select the correct answer below: The graph of f (x) has at most 10 turning points. The graph of f (x) has at most 9 turning points. The graph of f (x) has at most 8 turning points. The graph of f (x) has at least 8 turning points. The graph of f (x) has at least 10 turning points. The graph of f(x) has at least 9 turning points.