Which security measure involves screening cargo and checked baggage?

The choice regarding explosives detection systems is correct because these systems are specifically designed to identify explosive materials in cargo and checked baggage before they are loaded onto an aircraft. Explosives detection systems often utilize advanced technologies such as tomography, computed X-ray, or chemical analysis to detect potential threats that may not be visible to the naked eye. This is crucial for aviation security, as explosives can pose significant risks to passengers, crew, and the aircraft itself.

By effectively screening checked baggage and cargo, these systems enhance safety measures at airports, ensuring that potentially dangerous items are intercepted and dealt with before boarding. This level of scrutiny is vital for maintaining security in the aviation environment, where large volumes of baggage and cargo are processed daily.