What tools are required for the rapid extrication technique?

The correct answer is the backboard, as it is specifically designed to provide a stable and supportive platform for safely removing an injured person from a hazardous situation, such as water or a confined space. The backboard helps to immobilize the victim's spine and prevent further injury during the extrication process. This is particularly important in rescue scenarios where movement could exacerbate potential injuries.

The life vest, rescue boat, and rescue float serve other purposes in rescue operations, such as flotation or transporting individuals in water, but they are not fundamental tools for the rapid extrication technique. Using a backboard ensures the victim is protected and aids in a more efficient and safer rescue compared to using other flotation devices or equipment that are not designed for this specific purpose.