In public passenger transport buses (Category D), what is the driver's legal responsibility regarding passenger emergency exits (issues de secours)?

1. Ensure all emergency doors, roof hatches, and emergency break-glass windows are unobstructed, clearly signposted, and equipped with emergency hammer tools
2. Padlock all emergency doors shut to prevent passengers from disembarking without paying
3. Stack heavy cargo and passenger luggage directly in front of rear emergency doors
4. Remove all emergency window markings to improve panoramic views