What must a customer do if a CNG tank is located in the trunk of a vehicle?

When a CNG (Compressed Natural Gas) tank is located in the trunk of a vehicle, it is essential for the customer to be present during the inspection. The presence of the customer is crucial because the inspector may need to obtain information directly from them regarding the specifics of the CNG system, address any safety concerns, or clarify the installation details. Since CNG systems can have unique safety requirements and considerations, the customer's firsthand knowledge ensures that the inspector has all necessary information to perform a thorough and accurate inspection.

The other options, while potentially relevant in different contexts, do not directly address the specific requirement for a CNG tank inspection. Sending a representative may not provide the same level of information, and providing a safety document could be helpful but is not a substitute for the customer's presence. Calling the insurance provider does not directly contribute to the inspection process of the vehicle’s CNG system.