Which code would be used for an investigation?

• A. Mailbox Fire
• B. Lift Assist
• C. Mass Decon Response - UK Commonwealth Stadium
• D. Investigation

Answer: (D)

The idea here is to use a code that signals on-scene assessment is needed to determine what, if anything, is happening. When information is uncertain or limited, responders must be dispatched to investigate and identify the actual situation before committing to a specific incident type.

The investigation code is the best fit because it explicitly communicates that units should respond to assess the scene and verify whether there is a fire, a hazard, or some other condition. It prevents assuming a fire or a different event and allows the situation to be clarified on arrival, with follow-upDispatch as needed.

Other codes describe concrete scenarios: a mailbox fire would indicate an actual fire requiring suppression, a lift assist is a person-in-need medical/assistance call, and a mass decon response pertains to decontamination for a mass-casualty or hazardous-material scenario. These do not reflect the need for on-scene assessment to determine what’s occurring, which is why the investigation code is the correct choice.