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