Which of the following items must be verified during a commercial bus driver's daily pre-trip safety inspection (出车前检查)?

1. Tire pressure and tread condition, service/parking brakes, steering functionality, fire extinguishers, emergency hammers, and clear emergency exit pathways
2. Only the exterior cleanliness and passenger fare collection box
3. Only the audio system volume and destination digital LED sign
4. The vehicle fuel level only, leaving all mechanical inspections to the annual inspection station