The foci of an ellipse are $(0, \pm 1)$ and minor axis is of unit length . The equation of the ellipse

Question

$\begin{array}{1 1} 2x^2+y^2=2 \\ x^2+2y^2=2 \\ 4x^2+20y^2=5 \\ 20x^2+4y^2=5 \end{array}$