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