INLAND ONLY While underway you sight the lights shown in illustration D081RR below with the yellow lights flashing. The lights displayed indicate which of the following?

Correct Answer: Option B — dredge pipeline

33 CFR 83.27(b) specifies that a vessel engaged in dredging or underwater operations, when an obstruction to navigation exists, displays two red lights in a vertical line to indicate the side of the obstruction and two green lights to indicate the side on which a vessel may pass.