Provide an example of a "regulated item".

A regulated item is any item that requires strict controls and oversight due to its potential impact on safety, security, or operational readiness. Firearms and explosives exemplify this category because they are hazardous materials that can cause significant harm if misused or improperly managed. Therefore, they are subject to stringent regulations and protocols to ensure accountability and prevent unauthorized access.

The other options, while they may involve various levels of management and tracking, do not fall under the same regulatory categorization as firearms or explosives. Office supplies, furniture, and textbooks, although they might need to be tracked for inventory purposes, typically do not carry the same risk factors or regulatory requirements that apply to regulated items such as weapons or munitions.