Firefighters working from a ladder should use a safety belt or what to secure themselves to the ladder?

When firefighters are working from a ladder, it is crucial for safety to secure themselves effectively to prevent falls or accidents. The correct answer involves using a safety measure that specifically addresses this need. A leg lock provides a secure way for firefighters to attach themselves to the ladder while they carry out their duties. This method keeps them safely in place and allows them to focus on their tasks without the constant worry of potential slips or falls.

The other options do not serve the same purpose or may not be recognized in the same context. For instance, a man-saver generally refers to a device used for securing tools or equipment rather than a personal safety feature for individuals on a ladder. A Lyons strap and a Boston bar could be associated with different forms of securing equipment but are not specifically designed for ensuring the safety of individuals working on ladders. Therefore, the use of a leg lock is recognized as an effective and appropriate method for securing oneself for safety while performing duties from a ladder.