What is one of the primary functions of edge protection in rappelling?

The primary function of edge protection in rappelling is to prevent abrasion on the rope. When a rope passes over a sharp or uneven edge, it can suffer significant wear and tear, compromising its integrity and overall safety. Edge protection, which may consist of materials like padding or protective sleeves, is designed to create a buffer between the rope and the edge, reducing friction and preventing damage. This is crucial for maintaining the rope's strength and ensuring the safety of the individual rappelling, as a compromised rope can lead to failures during descent.

While the other options address important considerations in rappelling, they do not specifically relate to the primary purpose of edge protection. Speed of descent, supporting heavier loads, and stabilizing the anchor point are all relevant to the overall safety and effectiveness of rappelling but do not directly involve the role of edge protection in safeguarding the rope itself.