An architect is building a structure that will place vertical pillars at the vertices of regular hexagon ABCDEF, which is lying horizontally on the ground. The six pillars will hold up a flat solar panel that will not be parallel to the ground. The heights of the pillars at A, B, and C are 12,9, and 10 meters, respectively. What is the height, in meters, of the pillar at E?<spanclass=′latex−bold′>(A)</span>9<spanclass=′latex−bold′>(B)</span>63<spanclass=′latex−bold′>(C)</span>83<spanclass=′latex−bold′>(D)</span>17<spanclass=′latex−bold′>(E)</span>123