Which agency oversees workplace safety, including issues related to security?

The Occupational Safety and Health Administration (OSHA) is the correct answer because it is the primary federal agency responsible for ensuring safe and healthy working conditions for workers across various industries, including the security sector. OSHA develops and enforces workplace safety and health regulations, conducts inspections, and provides training, outreach, and education to employers and employees.

This agency focuses specifically on hazards that can occur in workplaces, promoting standards that help reduce risks, injuries, and fatalities. The guidance provided by OSHA is particularly relevant for security personnel who may encounter various dangers during their duties.

The other agencies listed, such as the FBI, NSA, and DHS, have different primary focuses. The FBI deals with federal law enforcement and criminal investigations, the NSA is focused on national security and intelligence, and the DHS is concerned with protecting the homeland from threats. While these agencies may touch upon aspects of safety and security, they do not oversee workplace safety regulations like OSHA does. Thus, the relevance and expertise of OSHA in workplace safety make it the correct answer to this question.