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23. [-/1 Points] DETAILS Determine whether each statement is true or false. You have one submission for each statement. (a) If f'(c) = 0, then f has a relative maximum or minimum at x = c. True False (b) If f'(x) changes from positive to negative at x = a, then f has a relative maximum at x = a. True False (c) If f'(x) = 0 on (a,b), then f is increasing on the interval (a,b). True False (d) If f'(c) does not exist, then f(x) has a critical point at x = c. 0) True False