(a) The graph in the figure given below is made of line segments joined end to (a) Choose the correct answer below. end. At which points of the interval [ - 2,6] is f' not defined? Give reasons for your answer. O A. f' is not defined at x = - 2, x= 1, and x = 4 because at these (b) Graph the derivative of f. points the graph has cusps. O B. f' is not defined at x = 0, x = 1, and x = 4 because at these points the graph has corners. O C. f' is not defined at x = 0, x = 1, and x = 6 because at these points 4- the graph has cusps. O D. f' is not defined at x = - 2, x= 1, and x = 4 because at these (6,2) points the graph has corners. (-2,0) X -2 (1, - 2) (4, - 2) -4