Which of the following statements correctly describes a readiness monitor?

A readiness monitor plays a crucial role in assessing the functionality of a vehicle's onboard systems. It is specifically designed to report whether the various emissions-related components, sensors, and systems within the vehicle are operating correctly. This is essential for ensuring that the vehicle meets environmental regulations and for passing emissions tests.

When a vehicle is tested for emissions, the readiness monitor provides information indicating whether the necessary systems have been checked and are working properly. If a system is not functioning as it should, it may not be ready for an emissions test, which can result in failing the inspection.

Other options may touch on relevant aspects of vehicle performance or compliance but do not directly pertain to the specific role and function of a readiness monitor, which is fundamentally focused on the operational status of emissions-related systems.