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The correct choice pertains to the function of a crowbar in overhaul operations, particularly focusing on the removal of window and door casings. In the context of firefighting and overhaul, a crowbar serves as a versatile tool that firefighters can use to gain access to various structural components that require assessment after a fire has been extinguished.

When it comes to window and door casings, the crowbar’s design allows firefighters to leverage its pointed end to pry away materials that may be weakened or damaged by fire. This is critical for ensuring that all hidden fire areas are identified and properly checked to prevent rekindling. Removing casings can help firefighters inspect and examine the structural integrity around windows and doors, which may be crucial for safety and further firefighting efforts.

While the crowbar can also be used in other aspects of overhaul operations, such as separation of debris or opening walls and ceilings, its primary role in removing casings stands out as an essential function during the overhaul phase.