The lights to be used by the sailboat at night is white sternlight. Thus the correct option is last one.
<h3>What is the white light on a boat called?</h3>The white light on the boat is the masthead which is assembled at the front of the boat. The light of the masthead should be visible till two miles away.
The complete question is attached below.
Therefore, whenever the sailor is operating the sailboat at night then he must make the use of the white sternlight. Thus 4th option is correct.
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