Choose the correct answers in $\int\frac{dx}{e^x+e^{-x}}$ is equal to

Question

$\begin{array}{1 1} (A)\;\tan^{-1}(e^x)+C \\ (B)\;\tan^{-1}(e^{-x})+C\\C\;log(e^x-e^{-x})+C \\ (D)\;log(e^x+e^{-x})+C \end{array} $