BOTH INTERNATIONAL & INLAND Which shapes shall a vessel transferring provisions or cargo at sea display during the day?

Correct Answer: Option C — three black shapes in a vertical line; the highest and lowest shall be balls and the middle one a diamond

Rule 27(b) dictates that a vessel restricted in her ability to maneuver, which includes those engaged in replenishment at sea, must display three shapes in a vertical line. The highest and lowest must be balls, and the middle must be a diamond, indicating the vessel's restricted status.