What is the correct technique for transferring a casualty with a suspected spinal fracture onto a stretcher?

1. Have one person pick up the shoulders while another picks up the knees like a hammock
2. Use a RIGID stretcher (硬质担架), with 3 to 4 rescuers positioned on the same side maintaining head-neck-torso in a single straight axis, executing a synchronized flat lift or log-roll (多人平托法 / 轴线翻身)
3. Roll the patient across the ground onto a soft canvas cloth
4. Seat the casualty upright on a folding camp chair