The margin plate is the（）. A: Aoutboard strake of plating on each side of an innerbottom B: Bouter strake of plating on each side of the main deck of a vessel C: Cplate which sits atop the center vertical keel D: Duppermost continuous strake of plating on the shell of a vessel

If a vessel is sagging，what kind of stress is placed on the sheer strake?（）