Which statement is TRUE for an unlighted, red and green, horizontally-banded buoys with the topmost band red?

Correct Answer: Option B — are conical in shape and called nun buoys

In IALA buoyage systems, red and green horizontally-banded buoys indicate preferred channels. With the topmost band red under IALA-A, the buoy is conical in shape, structurally termed a nun buoy, denoting the preferred channel is to port.