Mark against the correct answer in each of the following:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{(1+\cos x)}{(1-\cos x)} d x=?$

A. $-2 \cot \frac{x}{2}-x+C$

B. $-2 \cot \frac{x}{2}+x+C$

C. $2 \cot \frac{x}{2}+x+C$

D. none of these