Which of the following is essential for power tools to ensure safety?

The correct answer emphasizes the importance of safety features such as guards and safety switches on power tools. These components are crucial for preventing accidental injuries and ensuring that the tool can only be operated when it is safe to do so. Guards can help protect users from flying debris or moving parts, while safety switches often prevent the tool from starting accidentally. By incorporating these safety mechanisms, the risk of accidents is significantly reduced, promoting a safer working environment.

While brightly colored tools may help in visibility, it does not directly enhance safety during operation. Extra batteries are practical for prolonging use but do not contribute to the safety of the tools themselves. Similarly, using tools with multiple workers can increase risks if proper safety protocols are not in place. Thus, the presence of guards and safety switches is paramount for ensuring the safe operation of power tools.