Which statement is TRUE concerning a towing vessel which,due to the nature of her work,is unable to keep out of the way of another vessel?()
A、By day,she shall carry a black cylinder shape
B、By day,she shall carry two black balls in a vertical line
C、By night,she would show the same lights as a vessel not under command
D、By day,she would show the same shapes as a vessel restricted in her ability to maneuver