At exactly two of the labeled points in the figure below, which shows a function $f$, the derivative $f'$ is zero; the second derivative $f''$ is not zero at any of the labeled points. Select the correct signs for each of $f$, $f'$ and $f''$ at each marked point.

 Point A B C D E $f$ ? positive zero negative ? positive zero negative ? positive zero negative ? positive zero negative ? positive zero negative $f'$ ? positive zero negative ? positive zero negative ? positive zero negative ? positive zero negative ? positive zero negative $f''$ ? positive zero negative ? positive zero negative ? positive zero negative ? positive zero negative ? positive zero negative