What is required for the rearview mirror during the inspection?

The requirement for the rearview mirror during an inspection is that it must be securely mounted and provide an unobstructed view behind the vehicle. This is critical for safe driving, as the rearview mirror is used to monitor traffic conditions behind the vehicle. If the mirror is not securely mounted, it might move during driving, which can lead to a dangerous situation where the driver cannot see traffic clearly. Additionally, an unobstructed view ensures that no objects or obstructions interfere with the driver's ability to see vehicles or other hazards approaching from behind.

The other options address certain features of rearview mirrors but do not encompass the fundamental safety requirement outlined in the correct answer. For instance, while shatterproof glass enhances safety in the event of an accident, it is not a mandatory requirement for vehicle safety inspections. Similarly, features like automatic dimming or adjustability based on driver height, while beneficial for comfort and minimizing glare, do not directly relate to the essential function of maintaining an unobstructed rear view, making secure mounting and visibility paramount during inspection.