The graph of $f''$ is given in the figure below.

Draw graphs of $f$ and $f'$, assuming both go through the origin, and use them to complete the following statements (enter the $x$-values as x1, x2, etc.):

A. $f(x)$ is greatest at $x =$
B. $f(x)$ is least at $x =$
C. $f'(x)$ is greatest at $x =$
D. $f'(x)$ is least at $x =$
E. $f''(x)$ is greatest at $x =$
F. $f''(x)$ is least at $x =$