Which of the following is a supplementary terrain feature?

A supplementary terrain feature enhances the understanding of the terrain and assists with navigation, often providing additional context to main features. A "cut" refers to a section of ground that has been excavated or lowered, commonly seen in road construction or other engineering projects. This feature can indicate changes in elevation and is useful in understanding the layout of the terrain, helping with decision-making in navigation and planning.

In contrast, features like "elevation," "hilltop," and "obstacle" represent main terrain features or characteristics directly influencing movement and line-of-sight. Elevation and hilltops denote primary raised ground, while obstacles are challenges that can hinder travel and operations. Although they are important for tactical considerations, they do not serve the same supplementary role as cuts, which provide detailed insights about the terrain in relation to navigation.