$\int \frac{d x}{x^{2}-4}=$ কত ?

$\frac{1}{4} \ln \left|\frac{x-2}{x+2}\right|+c$

$\frac{1}{4} \ln \left|\frac{x+2}{x-2}\right|+c$

$\frac{1}{8} \ln \left|\frac{x-2}{x+2}\right|+c$

$\frac{1}{8} \ln \left|\frac{x+2}{x-2}\right|+c$