What should be done to ensure glad hands are working correctly?

Answer: A — Inspected for cracks and leaks

Ensuring that glad hands are working correctly is crucial for the safety and functionality of the air brake system in commercial vehicles. Inspecting glad hands for cracks and leaks is essential because these components connect the air hoses that supply brake pressure to the trailer. If there are any cracks or leaks, it can lead to air pressure loss, compromising the braking ability of the vehicle, which can result in dangerous situations on the road. Regular inspections can identify potential issues before they become serious problems, thus contributing to the vehicle's overall safety and reliability. Proper maintenance practices such as checking for physical damages and ensuring that no air is escaping from the connections help in maintaining optimal performance of the braking system.