Please choose the correct ending to complete the given sentence: Snow tubing: Skiers walk and stand on skis at the bottom of the hill at of a ski resort. kids

Ending1: stand on the steep hill watching the skiers get on and off the skis. Ending2: ride on inflatable tubes down lanes on a ski slope. Ending3: walk and stand on the hills at the bottom of the hill. Ending4: sled in the slopes through the ski resort.

Answer format: ending1/ending2/ending3/ending4