If \(\rm y = \frac{e^{2x} + e^{-2x}}{e^{2x} - e^{-2x}}\) then \(\rm \frac{dy}{dx}\) equals to

I. \(\rm \frac{-8}{(e^{2x} - e^{-2x})^2}\)

II. \(\rm \frac{-4}{(e^{x} - e^{-x})^2}\)

III. \(\rm \frac{8}{(e^{2x} - e^{-2x})^2}\)

Select the correct answer using the codes given below.