Please choose the correct ending to complete the given sentence: Playing water polo: A group of people are swimming in a public pool. they

Ending1: hit a ball back and forth in the water. Ending2: are using stilts to swim. Ending3: are watching as a man serves a ball into a net. Ending4: lob their cups over the side of the pool.

Answer format: ending1/ending2/ending3/ending4