What should you verify about the bus's mirrors?

The correct focus for verifying the bus's mirrors is that they should be securely mounted and adjusted properly. This ensures that the driver has a clear and accurate view of the surrounding area, which is crucial for safe driving and preventing accidents. Properly mounted mirrors reduce the risk of them becoming loose or falling off during operation, while correct adjustment allows the driver to minimize blind spots and maintain awareness of other vehicles, pedestrians, and obstacles.

The other options may introduce specific features or conditions that are less relevant to the basic safety requirement of ensuring the mirrors are secure and properly situated. For example, while tempered glass may be beneficial for durability, it is not a primary concern during a pre-trip inspection. Similarly, heating elements in mirrors can enhance visibility in icy conditions, but this is not a standard requirement. Lastly, checking the mirrors only during severe weather is not advisable, as consistent inspection is necessary regardless of conditions to maintain safety at all times.