What is the largest possible area of a quadrilateral with sides 1,4,7,8 ?<spanclass=′latex−bold′>(A)</span> 72<spanclass=′latex−bold′>(B)</span> 103<spanclass=′latex−bold′>(C)</span> 18<spanclass=′latex−bold′>(D)</span> 123<spanclass=′latex−bold′>(E)</span> 95 geometrytrapezoidarea of a triangle