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. OTrue OFalse (b) If f'(x) changes from positive to negative at x = a, then f has a relative maximum at x = a. OTrue OFalse (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 = C. OTrue OFalse