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