386 BOTH INTERNATIONAL & INLAND Your vessel is at anchor in fog. The fog signal of another vessel, apparently underway, has been growing louder and the danger of collision appears to exist. In addition to your fog signal, what signal may be used to indicate your presence?

A. No signal other than your fog signal may be used.
B. One prolonged, one short, and one prolonged whistle blast
C. One prolonged followed by two short whistle blasts
D. One short, one prolonged, and one short whistle blast