Please choose the correct ending to complete the given sentence: Slacklining: A person is slacklining reach the mountain summit near a town. People slack to pass from a mountain to another mountain. a man slacks

Ending1: the skiis slowly down a street. Ending2: while doing slacklines above a river. Ending3: to pass from a summit to another summit. Ending4: his legs on his rock to fly in the air.

Answer format: ending1/ending2/ending3/ending4