The graph of f' , determine which are true about graph of f

y - f'(x) C B 5 -4 -3 -2 -1 1 2 3 4 5 2 A I. f is increasing at A II. f has a local minimum at B. III. f is increasing at C. IV. f is concave up for all z. I and Ill only O II, Ill, and IV only None are true. O All are true. O IV only O I, II, and Ill only II only