Two equilateral triangles are contained in a square whose side length is 2 \sqrt{3}. The bases of these triangles are the opposite sides of the square, and their intersection is a rhombus. What is the area of the rhombus?
Answer Choices
A. \dfrac{3}{2}
B. \sqrt{3}
C. 2 \sqrt{2}-1
D. 8 \sqrt{3}-12
E. \dfrac{4 \sqrt{3}}{3}