When the sun dazzles the vehicle's driver, he must:

1. AOvertake the vehicle ahead, because it is better to drive on a clear road.
2. BSlow down his driving according to the existing range of vision and use the sun visor.
3. CTurn his gaze to the side and not look ahead, so that he is not dazzled.
4. DStick close to the vehicle ahead so that it shields him from the sun's rays.

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