Upgrade subject to access all content

The square root of the quotient of a number with $6$ is $\ell$ squared. Which equation represents this relation?

$\sqrt{\cfrac{6}{x}}=\ell^2$

$\cfrac{x}{\sqrt{6}}=\ell^2$

$\cfrac{\sqrt{x}}{6}=\ell^2$

$\sqrt{\cfrac{x}{6}}=\ell^2$

None of these