What should be visually checked for on the MWS apparatus windows?

The correct choice highlights the importance of inspecting the MWS apparatus windows for cracks and discoloration. This is crucial because cracks can compromise the structural integrity of the windows and potentially lead to failures in the water supply system. Discoloration may indicate ongoing damage or exposure to environmental factors that could weaken the glass over time. Both issues can affect visibility and the overall functionality of the apparatus. Regular checks for these problems are essential to ensure the safety and reliability of the water supply.

While other visual checks like frame integrity, absence of scratches, and proper alignment are important for overall maintenance, they may not directly impact the immediate usability and safety of the windows in the same way that detecting cracks and discoloration does. Ensuring that the windows are free from these critical flaws should be a priority during inspections.