In a severe multi-casualty passenger bus traffic accident, what is the standardized triage and rescue prioritization principle (检伤分类与急救原则) for first aiders?

1. 'Save life before limb, treat severe before mild' (先救命、后救伤，先重后轻): prioritize patients with airway obstruction, massive hemorrhage, or cardiac arrest over minor fractures or deceased individuals
2. Treat individuals with minor cosmetic scrapes first because they are screaming the loudest
3. Focus entirely on retrieving passenger baggage before checking on any injured occupants
4. Provide first aid exclusively to the youngest children while ignoring all adults