Find the Derivative $f(x)=\ln \left(9+e^{2 x}\right)$ A) $\frac{e^{2 x}}{1+e^{2 x}}$ B) $\frac{1}{9+e^{2 x}}$

Multiple Choice

Find the derivative.
- $f(x) =\ln \left(9+e^{2 x}\right)$

A) $\frac{e^{2 x}}{1+e^{2 x}}$
B) $\frac{1}{9+e^{2 x}}$
C) $\frac{1}{e^{2 x}}$
D) $\frac{2 e^{2 x}}{9+e^{2 x}}$