What must be tested for proper operation in wiper systems during an inspection?

The correct answer highlights the importance of ensuring that both the wipers and the windshield washer fluid system are functioning effectively as part of a comprehensive inspection. For wiper systems, it's essential to verify that the wiper blades can clear the windshield properly, which ensures driver visibility in adverse weather conditions. Additionally, the washer fluid system must be operational, as it provides essential assistance in clearing dirt, grime, or debris from the windshield, further enhancing safety.

Checking only the windshield for chips does not address the overall effectiveness of the wiper system. Similarly, replacing wiper blades without assessing their actual condition disregards responsible maintenance practices; blades should only be replaced when they show signs of wear that affect their performance. Lastly, examining wipers without testing the fluid would not provide a complete picture of the system’s effectiveness in promoting visibility, as both components must work together to ensure proper function.