Which buoy will have an even number according to the buoyage system?

In the context of the U.S. Aids to Navigation system, buoys are color-coded and numbered to help mariners navigate safely. Even-numbered buoys are designated as the green buoys in this system.

Nun buoys, which are often described as conical in shape and colored red, are typically marked with odd numbers. They are used in the lateral buoyage system to indicate the right side of a channel when approaching from the sea. In contrast, can buoys, which are cylindrical and green, are assigned even numbers and signify the left side of the channel when entering from the sea.

Thus, the correct answer regarding the identification of an even-numbered buoy aligns with the function of can buoys in the system. They guide vessels safely through navigable waters by using color and numbering conventions, aiding in the recognition of safe passage routes and channel markers.