531. A large automated navigational buoy, such as those that have replaced some lightships, would be shown on a chart by which symbol in illustration D015NG below?

Choice B is correct; it is the chart symbol for a large automated navigational buoy (LANBY), which has replaced some lightships. LANBYs are unmanned buoys with lights and equipment, represented by a buoy symbol, unlike lightships which have ship hulls or fixed lights which are tower shapes.