A vessel，which is unable to maneuver due to some exceptional circumstance，shall exhibit （）.
- Aduring the day，three balls in a vertical line
- Bduring the day，three shapes，the highest and lowest being balls and the middle being a diamond
- Cwhen making way at night，two all-round red lights，sidelights，and a sternlight
- Dwhen making way at night，masthead lights，sidelights，and a sternlight