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Determine whether each statement is true or false. You have one submission for each (a) If f '(c) = O, then f has a relative maximum or minimum at x = c. statement. OTrue OFalse (b) If f '(x) changes from positive to negative at x OTrue OFalse a, then f has a relative maximum at x (c) If f '(x) 2 0 on (a,b), then f is increasing on the interval (a,b). OTrue OFalse (d) If f '(c) does not exist, then f(x) has a critical point at x OTrue OFalse c.