# The volume of a cube is increasing at the rate of $8\;cm^ 3/s$ . How fast is the volume of a cube is increasing at the rate of $8\;cm^ 3 /s$ . How fast is the surface area increasing when the length of an edge is $12 cm$?
$\begin{array}{1 1} (A)\;\frac{8}{3}cm^2/s \\ (B)\;\frac{-8}{3}cm^2/s \\(C)\;\large\frac{8}{3} \normalsize m^2/s \\ (D)\;\frac{-8}{3}m^2/s\end{array}$