Previous Problem Problem List Next Problem (1 point) At exactly two of the labeled points in the figure below, which shows a function f, the derivative f' is 0; the second derivative f" is not 0 at any of the labeled points. For each of f, f' and f" at each marked point, enter the correct sign: "P" for positive, "N" for negative, or "0" for zero. signs, D Point A B C D E f