True or False: The crossover convex mirrors should be adjusted to see the front bumper.

The statement is true because crossover convex mirrors are designed to enhance the driver's visibility of areas that may be difficult to see directly, particularly in relation to the front bumper of the bus. By adjusting these mirrors to reflect a view of the front bumper, the driver can better monitor the immediate vicinity of the bus, which is crucial during maneuvers like backing up or making turns. This adjustment helps to prevent accidents and ensure the safety of pedestrians and other vehicles nearby, especially in scenarios where children might be boarding or disembarking from the bus.

The other options may suggest various limitations or conditions under which mirrors should be adjusted, but the primary safety principle is to ensure that the driver has a complete view of the areas around the bus, including the front bumper, at all times. This encourages proactive awareness and minimizes risks when operating the vehicle, regardless of the specific situation.