5) The definition of the derivative of f(x) = x3 at x = -2 is: a)f( - 2) = lim ( - 2 + h) - (-2) h - 0 h b ) of'l - 2 = lim (- 2 + h) +8 h - 0 h c ) O f - 2 = lim (- 2 + h)' - (-8)3 h - 0 ( - 8) 2 )0 f' 1 - 2 ) = lim ( - 2 - h)5 - 23 h - 0 h