Which type of nozzle can be shut down and separated at the bale?

The correct answer is the break-away nozzle. This type of nozzle is specifically designed to be shut down and separated at the bale, often utilized in situations where it is important to prevent accidental damage or injury if the nozzle becomes entangled or pulled away from the hose. The break-away feature allows for a quick disconnection while maintaining safety and functionality, minimizing the likelihood of the hose or nozzle becoming a hazard during operations.

While combination nozzles, fog nozzles, and variable pressure nozzles serve useful functions in various firefighting scenarios, they do not incorporate the same design feature that allows them to separate cleanly at the bale. A combination nozzle provides both straight stream and fog pattern capabilities, a fog nozzle is explicitly designed for creating a spray pattern to maximize cooling and exposure to fire, and a variable pressure nozzle allows for adjustments in stream output but does not have a breakaway capability.