BOTH INTERNATIONAL & INLAND A vessel anchored in fog may warn an approaching vessel by sounding __________.

Correct Answer: Option B — one short, one prolonged, and one short blast of the whistle

COLREGS Rule 35(h) permits an anchored vessel to supplement its mandatory bell or gong signals by sounding three distinct whistle blasts—one short, one prolonged, and one short—to warn an approaching vessel of an impending collision risk.