An aircraft has indicated that he wants you to change course and follow him. You cannot comply because of an emergency on board. Which signal should you make?()
A、Fire a red flare at night or a red smoke signal by day
B、Send the Morse signal "N" by flashing light
C、Make a round turn (360°) and resume course
D、Make an "S" turn (hard right then hard left) and resume course
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