What lights will a ram use to show a preferred side of passing?

A ram is a type of vessel that displays special lights to indicate its preferred side for other vessels to pass. This signaling is crucial for ensuring safe navigation and avoiding collisions.

In maritime navigation, displaying two greens for starboard and two reds for port is a standard way to indicate the vessel's intent. By showing two green lights, a ram signals that it prefers vessels to pass on its starboard side (right side from the perspective of someone facing forward on the vessel). Conversely, the display of two red lights indicates that vessels should pass on its port side (left side).

This method of signaling facilitates clear communication between vessels in close quarters, helping to maintain safety and order on the water. The combination of two lights for each side is specifically designed to provide clarity, ensuring that other vessels can easily recognize the preferred passing direction from a distance and at night.

The other options provided do not align with the standard practices for signaling preferred passing sides for vessels like a ram, as they either mix signaling colors inappropriately or use misleading descriptions of light configurations.