Which of the following best describes a military advantage the south held relative to the north during the civil war?a. northern armies would have to invade the south, meaning different landb. most of the nation's best military officers lived in the south and therefore sided and helped the southc. the result of the battle was that the Union army took over much of the Confederates' important cities/rivers/railroads which gave the Union an advantage and the South many disadvantagesd. Both a & b