Let ABCD be a square with side a = 2. The radius of the circle passing through midpoint E of side AB. centre O of the square, and vertex C is equal to: A) [tex] \frac{1}{2} \times \sqrt{10} [/tex] B) [tex] \frac{3}{2} [/tex] C) [tex] \sqrt{3 } [/tex] D) [tex]2[/tex]