Please choose the correct ending to complete the given sentence: Snow tubing: There are several people getting ready to ski. there

Ending1: 's a person skiing downhill with full speed whose shadow can be seen. Ending2: are several tubes lined up in a lined pathway going down a hill. Ending3: is a man sitting at a piano and playing the piano for the very first time. Ending4: are numerous inches of snow on the ground and they're playing snowboard.

Answer format: ending1/ending2/ending3/ending4