Which is a basic type of powered hydraulic tool used in rescue incidents?

A basic type of powered hydraulic tool commonly used in rescue incidents is the spreader. Spreaders are designed to create space by applying force to open objects, such as vehicle doors or debris, making it easier for rescuers to access trapped individuals. They are part of the "Jaws of Life" systems that also include cutters, enhancing the efficiency of rescue operations by allowing emergency responders to quickly gain entry or provide vital assistance in challenging situations.

The other tools mentioned, while useful in specific contexts, do not primarily serve the same function as powered hydraulic tools utilized in rescue scenarios. Struts are typically used to stabilize and support collapsed structures, hux bars are manual tools for prying or manipulating objects, and extension adzes are mostly hand tools used in different tasks such as cutting or shaping materials. Therefore, among the choices provided, the spreader stands out as the correct answer due to its direct application in rescue operations.