Please choose the correct ending to complete the given sentence: Playing water polo: Two water polo teams compete in a pool. the referee

Ending1: gives two thumbs up as the teams get into the center of the swimming pool. Ending2: prepares their jump rope. Ending3: blows the whistle on a foul by the defender and the play stops. Ending4: assists the winning team.

Answer format: ending1/ending2/ending3/ending4