Integrate the functions\[\frac{\sec^2x}{\sqrt{\tan^2x+4}}\]

Question

$\begin{array}{1 1}\log\mid\tan x+\sqrt{\tan^2x+4}\mid+c \\ \log\mid\tan x-{\tan^2x+4}\mid+c \\ \log\mid\tan x-\sqrt{\tan^2x+4}\mid+c \\ \log\mid\tan x+\sqrt{\sec^2x+4}\mid+c \end{array} $