Find the eccentricity of the ellipse x236+y216=1\frac{x^2}{36} + \frac{y^2}{16} = 136x2+16y2=1.
12\frac{1}{2}21
53\frac{\sqrt{5}}{3}35
23\frac{2}{3}32
32\frac{\sqrt{3}}{2}23