integrate : $\int \large\frac{1}{\sin ^2 x \cos ^2 x }$$dx$

Question

$$\begin {array} {1 1} (a)\;\sec x+ \tan x +c \\ (b)\;\tan x - \sec x +c \\ (c)\;\tan x +\cot x+c \\ (d)\;\tan x - \cot x +c \end {array}$$