Which of the following is true of hand-tool safeguarding?

The assertion about bent handles on hand tools is based on the ergonomic principle that certain designs can reduce the risk of repetitive strain injuries, such as tissue compression disorders. Tools with bent handles can help maintain a more natural wrist position during use, thereby reducing the risk of discomfort or injury that may arise from awkward postures. These ergonomic considerations are vital in promoting user safety and health in various tasks, particularly in construction and manual labor where hand tools are commonly utilized.

The other options do not hold true in the context of general hand-tool safety. Not all hand tools require guards, as their design often incorporates safety features directly in their construction. Also, the notion that hand tools are inherently safe without safety measures overlooks the importance of proper handling and maintenance. Lastly, stating that longer tools are always safer does not take into account the risks associated with their increased leverage or control issues that can come with size, making it essential to evaluate each tool's application and user situation individually.