What is the indicator that a vehicle has passed its annual inspection?

A valid inspection sticker affixed to the vehicle is the official indicator that it has passed its annual inspection. This sticker serves as proof that the vehicle has undergone the required inspection process, ensuring that it meets safety and operational standards set by regulatory authorities. The presence of the sticker typically includes details such as the inspection date, expiration date, and sometimes the inspector's identification number.

The other choices do not provide valid evidence of a passed inspection. While cleaning the vehicle, completing a checklist, or having the inspection conducted by the owner might indicate some level of maintenance or verification, they do not fulfill the requirement of a recognized inspection outcome. The inspection sticker is a formalized and recognized symbol of compliance with safety regulations, making it essential and definitive for identifying inspection status.