Which is a type of indirect attack on a wildland fire?

The choice selected is a type of indirect attack on a wildland fire because a parallel attack involves positioning oneself alongside the fire's edge, allowing firefighters to establish control lines while taking advantage of natural barriers or the terrain. This method allows for reducing the intensity of the fire while minimizing the risk to personnel since it typically avoids direct confrontation with the flames.

In contrast, flanking focuses on attacking the fire from the sides, which can also be a part of an indirect attack but is more about maneuvering to catch the fire in its less intense areas. Direct attacks involve fighting the fire directly at its leading edge, which is a frontline approach. Hot spotting refers to identifying and addressing specific areas where the fire is most active or threatening, which does not pertain to the technique of indirect attack itself.