Final answer:
A vessel unable to maneuver due to exceptional circumstances should display two red lights in a vertical line, two all-round lights (red over white), and in daylight, two black balls or similar shapes in a vertical line. The options in the question are not consistent with maritime regulations.
Step-by-step explanation:
The question is about what a vessel that cannot maneuver due to some exceptional circumstance should display. According to the International Regulations for Preventing Collisions at Sea, a vessel not under command—that is, unable to maneuver as stipulated due to an exceptional circumstance—should display two red lights in a vertical line to indicate this situation to other vessels. Along with these two red lights, the vessel should also exhibit two all-round lights: red over white. The two additional markers that should be shown in daylight are two black balls or similar shapes in a vertical line. This regulation ensures that other vessels understand their status and avoid possible collisions. Therefore, the options mentioned in the question are not consistent with these established maritime navigation regulations.
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