單項選擇題

A vessel is carrying three lights in a vertical line. The highest and lowest of these are red and the middle light is white. Which statement is always TRUE? ()

A.During the day,she would display three balls in a vertical line
B.If making way,she would show masthead lights at night
C.If at anchor,she need not show anchor lights while displaying identifying lights
D.Her fog signal would consist of a rapid ringing of a bell for five seconds every minute

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