33. What light signal shall be exhibited for a vessel engaged onpilotage duty while underway?
(A) At or near the masthead, two all-round lights in a verticalline, the upper being red and the lower white. Sidelights and asternlight.
(B) At or near the masthead, two all-round lights in a verticalline, the upper being white and the lower red. Sidelights and asternlight.
(C) At or near the masthead, two all-round lights in a verticalline, the upper being green and the lower red. Sidelights and asternlight.
(D) At or near the masthead, two all-round lights in a verticalline, the upper being red and the lower green. Sidelights and asternlight.