Find the relative extrema of the function f(x) - 8x - 120x3 + 43. O relative maximum at _ = 0; relative minimum at z = -3 and z = 3. Ono relative maximum; relative minimum at r = 0 relative maximum at z = -3; relative minimum at = = 3. O relative maximum at z = 3; relative minimum at = =-3 relative maximum at - -3 and z - 3; relative minimum at z = 0