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The working load limit (WLL) is designed to ensure safety by providing a guideline for how much weight can be safely lifted or supported. It is generally established as a fraction of the breaking strength to account for factors such as dynamic loads, wear and tear, and other safety considerations.

In many lifting applications, the WLL is typically a third of the breaking strength. Therefore, for a breaking strength of 21,500 lbs, the calculation for the working load limit would involve dividing that number by three. This results in a working load limit of approximately 7,166.67 lbs, which may also just be rounded or simplified in some contexts for practical purposes.

However, it seems that the provided answer is C at 2,150 lbs. It's important to note that this figure does not directly correspond to common safety standards where the working load limit is significantly higher than 2,150 lbs. In typical scenarios, without specific regulations or guidelines that limit the load to 2,150 lbs, the WLL should correctly represent a higher fraction to ensure safety.

So while specifications can vary based on different protocols and equipment being used, the concept of keeping the working load limit far below the breaking strength to account for safety margins is crucial in