Which one of the following is true about red buoys under the us aids to vavigation system?

Under the U.S. Aids to Navigation System, red buoys are used to mark the right side of a channel when entering from sea, following the "red-right-return" rule. They are typically cylindrical in shape and may have a topmark, often a red light or a reflective surface. Red buoys are also often numbered with even numbers that increase as you move upstream.