Regular polygons with 5,6,7, and 8 sides are inscribed in the same circle. No two of the polygons share a vertex, and no three of their sides intersect at a common point. At how many points inside the circle do two of their sides intersect? <spanclass=′latex−bold′>(A)</span>52<spanclass=′latex−bold′>(B)</span>56<spanclass=′latex−bold′>(C)</span>60<spanclass=′latex−bold′>(D)</span>64<spanclass=′latex−bold′>(E)</span>68