What is a characteristic of a marginal anchor?

A marginal anchor is characterized by its unreliability and inherent weakness when subjected to loads. This type of anchor may not be constructed or positioned in such a way as to support the forces generated during a rescue operation effectively. Marginal anchors often depend on factors such as their placement, environmental conditions, or the materials used, which can fluctuate and compromise their strength and stability.

In contrast, options describing anchors as reliable under high loads, strong and durable, or only suitable for light loads suggest characteristics that would typically apply to a more secure and robust anchoring system. However, these do not accurately reflect the nature of a marginal anchor, which is typically a weaker choice that might fail under significant stress, thus making it unsuitable for critical rescue applications. Understanding the characteristics of different anchor types is essential for ensuring safety and effectiveness in rope rescue scenarios.