Use the graph at right for questions 4 and 5. It consists of a semicircle and two line segments. 4. f'(x) = 0 for x = A. 1 B. 2 C. 4 D. 1 and 4 5. f'(x) does not exist for x = A. 1 only B. 1 and 2 C. 2 and 6 D. 0, 1, 2, and 6 -2- -2 y f(x) 6 X

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