The four standard light colors used for lighted aids to navigation are red, green, white, and __________.

Correct Answer: Option D — yellow

USCG Aids to Navigation (ATON) systems utilize four distinct light colors: red, green, white, and yellow. Yellow lights are specifically reserved for special purpose marks, which include anchorage areas, dredging operations, or traffic separation schemes, as defined in the U.S. Coast Guard Light List and 33 CFR Part 62.