What should be checked regarding the stickers on the windshield?

The correct focus is on ensuring that no illegal stickers are present on the windshield. This is important for compliance with relevant regulations and safety standards. Illegal stickers might include those that obscure the driver's view, contain offensive materials, or are not authorized by local laws. Ensuring that the stickers on the windshield adhere to regulations contributes to both the legality and safety of operating the vehicle, thereby preventing any potential citations or safety hazards while driving.

Other options might address various aspects of sticker requirements or aesthetic preferences, but they do not directly relate to the crucial aspect of safety and compliance that selecting the absence of illegal stickers represents.