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

Question

\[\begin {array} {1 1} (a)\;\sin x - \cos x +c \\ (b)\;\cos x- \sec x +c\\ (c)\;\tan x - \cot x +c \\ (d)\;None \end {array}\]