The number of distinct lines representing the altitudes, medians, and interior angle bisectors of a triangle that is isosceles, but not equilateral, is:
<spanclass=′latex−bold′>(A)</span>9<spanclass=′latex−bold′>(B)</span>7<spanclass=′latex−bold′>(C)</span>6<spanclass=′latex−bold′>(D)</span>5<spanclass=′latex−bold′>(E)</span>3