Let $f(x)=\frac{(x-2)^2-9}{3}$. The equation $y=f(x)$ is graphed, and the $x$- and $y$-intercepts of the graph are connected to form a polygon. What is the area of that polygon?
(A)5 (B)\frac{25}{6} (C)\frac{\sqrt{2465}{9} (D)2
A