Which of the following knots can be used to join ends of an accessory cord for a Prusik sling?

• A. Reef knot or bowline
• B. Fisherman's knot or figure 8 bend
• C. Alpine butterfly or square knot
• D. Double knot or clove hitch

Answer: (B)

The Fisherman's knot or figure 8 bend is recognized as a reliable and effective method for joining the ends of an accessory cord to create a Prusik sling.

The Fisherman's knot is particularly well-suited for this purpose as it creates a strong, secure connection between two lengths of cord, which is essential for maintaining safety during climbing or rescue operations. Its design helps in preventing slippage, ensuring that the knot remains secure under load, which is critical when using a Prusik knot in climbing or rescue scenarios.

The figure 8 bend, on the other hand, is also widely used in climbing and rescue work to join two ropes. It provides a robust connection that can handle dynamic loads, making it another suitable choice when creating a Prusik sling. Both knots are popular among outdoor and rescue professionals for their reliability and ease of untangling after use, two key attributes for a knot that may be subjected to heavy loads and stress.

Other knots listed in the options do not provide the same level of security or functionality for this specific application, making the Fisherman's knot or figure 8 bend the optimal choices for creating a reliable Prusik sling from accessory cord.