What is one technique to prevent accidental starting of the chainsaw?

Activating the chain brake before starting the saw is an effective technique to prevent accidental starting. The chain brake immobilizes the chain, ensuring that it does not move during the starting process. This safety feature helps to protect the operator and bystanders from potential injuries caused by an unintentional activation of the chain when the saw is started.

Other options, while important for overall safety and operational readiness, do not specifically address the prevention of accidental starts. For instance, checking the fuel level is a good practice to ensure the saw operates effectively, but it does not directly prevent the chain from moving during the start-up. Similarly, wearing protective eyewear is crucial for personal safety but does not prevent the saw from starting accidentally. Keeping both hands off the saw could be relevant in some contexts but does not specifically address the control of the chain's movement during start-up. Therefore, engaging the chain brake is the most effective preventative technique among the choices provided.