Problem 4: (15 points) The graph of y = f'(x) is shown on the right (the function is defined on the whole R). Using the labels already present on the graph, and explaining how, indicate the points where f has its (i) critical points (if any) b C d + - a Le (ii) local maxima (if any): (iii) local minima (if any): (iv) inflection points (if any)