What is \int \frac{dx}{x(x^{7}+1)} equal to ? [NDA I 2017]

Correct Answer is : 17ln|x7x7+1|+c

\frac{1}{2}\ln| {x^{7}-1}/{x^{7}+1}|=c

\frac{1}{7}\ln| {x^{7}+1}/{x^{7}}|+c