Please choose the correct ending to complete the given sentence: Making a lemonade: Lemons are juiced one at a time and then put in a pot with sugar. sparkling water

Ending1: is poured into a pot with lemon juice. Ending2: is added and then the mixture is added to this creating sparkling lemonade. Ending3: bubbles in a pot with sugar. Ending4: is added to the pot with the sugar.

Answer format: ending1/ending2/ending3/ending4