Find all of the critical points of the function A. x = 0 f (x) = 13x| B. x - 3, x - -3 C. x - 3, x = 0, X - -3 f() - 13x) D. If (x) has no critical points. 2 -2\fFind the interval (s) where the function f ( x ) = 1 is increasing. A. X 2 0 B. X > 0 C. X 50 D. X 1 is increasing. B. -1 1 D. -1/3 0 C. All real numbers x D. x 0