Please choose the correct ending to complete the given sentence: River tubing: A group of rafters are floating toward the small waterfall. They go down the falls into the rapid white coiling waters. they

Ending1: wave as they go by the camera, and continue to float downstream. Ending2: go under and continue to float through the calm waters. Ending3: are towed, then pulled by a wake board. Ending4: swim for the rocks one at a time.

Answer format: ending1/ending2/ending3/ending4