Please choose the correct ending to complete the given sentence: Playing rubik cube: A group of boys are seated at tables. they

Ending1: are trying to solve rubik's cubes puzzles. Ending2: are engaged in a game of foosball together. Ending3: are playing volleyball as the game progresses. Ending4: are playing shuffleboard back and forth.

Answer format: ending1/ending2/ending3/ending4