Which of the following describes a proper hand signal when wanting an operator to lower a load?

The choice to extend both arms down is the correct hand signal for indicating to an operator that a load should be lowered. This signal is universally understood in rigging and lifting operations. By extending both arms downward, the signaler is providing a clear visual cue that communicates the direction in which the load should move. This form of communication is essential in ensuring safety and coordination when working alongside machinery or when operators are at a distance.

In contrast, the other options do not convey the same clear instruction. For instance, extending both arms up would suggest lifting or raising an object, while patting the head or swinging a tool does not provide any specific, universally recognized instruction for lowering a load. Understanding and acknowledging these signals are crucial for maintaining a safe work environment and ensuring that all team members are on the same page during lifting operations.