The function f(x) (2x + 1)(x - 2)² has a turning point at x = 2, which of the following statements are true? Select one: O a. f(x) has a maximum at the turning point. O b. f(x) has no tangent at the turning point. O c. f(x) has a point of inflection at the turning point. O d. f(x) is undefined at the turning point. O e. f(x) has a minimum at the turning point.