Please choose the correct ending to complete the given sentence: Skiing: A man is surfing, biking, and mountain climbing. he

Ending1: is riding a surf board, then riding the surf board. Ending2: goes around a large waterfall and ahead of him there are some other surfers. Ending3: does all of the acrobatics on the mountain using a surf board. Ending4: ; is then seen climbing the side of a mountain with skis.

Answer format: ending1/ending2/ending3/ending4