Please choose the correct ending to complete the given sentence: Laying tile: A person trowels wet concrete on the ground. Another person uses a piece of wood to level the concrete. a water mixture

Ending1: is added to a bowl. Ending2: is added to bowl. Ending3: is poured on the concrete, it is scored and tiles are pounded on top. Ending4: is used to mix beach water and sand mix.

Answer format: ending1/ending2/ending3/ending4