The interval in which $x$ must lie so that the greatest term in the expansion of $(1+x)^{2n}$, ($x>0$) has greatest coefficient is

Question

$\begin{array}{1 1} \bigg(\large\frac{n-1}{n},\frac{n}{n-1}\bigg) \\\bigg(\large\frac{n}{n+1},\frac{n+1}{n}\bigg) \\\bigg(\large\frac{n}{n+2},\frac{n+2}{n}\bigg) \\ \bigg(\large\frac{n-1}{n+1},\frac{n+1}{n-1}\bigg) \end{array} $