Please choose the correct ending to complete the given sentence: Slacklining: A person is walking along a slack line. they

Ending1: are laying down flat on their back for a length of time. Ending2: get into a truck and start bungee jumping over the lines. Ending3: are moving back and forth on the slack line. Ending4: get in the raft and float.

Answer format: ending1/ending2/ending3/ending4