A sphere with center O has radius 6. A triangle with sides of length 15,15, and 24 is situated in space so that each of its sides is tangent to the sphere. What is the distance between O and the plane determined by the triangle?

**Answer Choices**

A. $2\sqrt{3}$

B. 4

C. \$3\sqrt{2}\$
D. $2\sqrt{5}$

E. 5