Let R be a square region and n \geq 4 an integer. A point X in the interior of R is called n-ray partitional if there are n rays emanating from X that divide R into n triangles of equal area. How many points are 100-ray partitional but not 60-ray partitional?

**Answer Choices**

A. 1500

B. 1560

C. 2320

D. 2480

E. 2500