If the latus rectum of an ellipse is equal to half of minor axis,then find its eccentricity.

Question

$\begin{array}{1 1}e=\large\frac{2}{\sqrt 3}\\e=\large\frac{\sqrt 3}{2}\\e=\large\frac{4}{\sqrt 3}\\e=2\sqrt 3\end{array} $