INTERNATIONAL ONLY When two vessels are in sight of one another and NOT in or near an area of restricted visibility, any of the following signals may be given EXCEPT __________.

Correct Answer: Option B — four short whistle blasts

Four short blasts represent the pilot vessel signal under Rule 35(e) for restricted visibility conditions. Under clear visibility when vessels are in sight of one another, this signal is invalid for general maneuvering communication under COLREG Rule 34.