30.某船舶不小心誤航進入「軍事演習」區域，深夜中突然收到海軍軍艦發送之「U」燈號，並且重覆此信號，試問此信號的意義為何？ (A)You are running into danger (B)I require assistance (C)I am altering my course to port (D)I wish to communicate with you