During a bus fire with dense toxic smoke accumulating in the passenger compartment, how should the driver instruct passengers to evacuate to minimize smoke inhalation?

1. Cover the mouth and nose with a damp cloth or clothing item, bend low to stay below the rising toxic smoke layer, and exit in an orderly, rapid sequence without pushing
2. Stand upright, take deep breaths, and run toward the front door while screaming
3. Lie flat on the floor and refuse to move until firefighters arrive
4. Open all personal luggage to find valuable jewelry before moving