Please choose the correct ending to complete the given sentence: Rock climbing: Mountain climbers use ropes and hooks to metal clips up along cracks in a sheer rock face. The climber sets a metal round clips into the crack of the rock face. clouds

Ending1: move over a mountain range at sunset. Ending2: of bats fly through the sky. Ending3: of steam follow from the metal cylinders. Ending4: of steam comes out at the climbers touch it.

Answer format: ending1/ending2/ending3/ending4