What specific markings are present on a nonprecision runway?

The correct choice highlights the specific markings, particularly threshold and aiming point markings, that are unique to nonprecision runways. Nonprecision runways serve aircraft that rely on visual cues and basic navigational aids, rather than precision instrument approaches.

Threshold markings indicate the beginning of the runway's usable length, and they help pilots determine where to land safely. Aiming point markings offer a reference point for pilots when they approach the runway, guiding them to land in the optimal area down the runway. These markings are critical for ensuring that the landing is conducted safely and within the designated parameters of a nonprecision approach.

In contrast, other options like runway edge markings and side stripe markings have broader applications and are not unique to nonprecision runways. Touchdown zone markings are also more characteristic of precision runways, as these runways are designed for more sophisticated instrument approaches, which depend on more precise visual references during landing. Therefore, threshold and aiming point markings are key identifiers of the operational characteristics of nonprecision runways.