What is the equation of the parabola shown below?

A. $y = \frac{1}{2\sqrt3}x^2 + 2\sqrt3x+4$
B. $y = \frac{1}{\sqrt3}x^2 + \sqrt3x+4$
C. $y = \frac{1}{2\sqrt3}x^2 - \sqrt3x+4$
D. $y = \frac{1}{\sqrt3}x^2 - \sqrt3x+4$
E. $y = \frac{2}{\sqrt3}x^2 - 2\sqrt3x+4$