Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make baking soda crystals [title] Boil the water. [step] To make baking soda crystals, you start by making a water solution that's saturated with baking soda. The baking soda will dissolve better in warm water.

Ending1: Measure 2 cups (470 ml) of water into a kettle. Turn on the kettle to boil the water. Ending2: A large pot will work, as long as the water temperature is medium. [substeps] You can also use a kettle, but never boil this water. Ending3: Fill a strainer or a large bottle or container with water. Boil water for 10 minutes, stirring occasionally. Ending4: So, set the temperature to the water content appropriate for the nature of your mixture. [substeps] If you haven't had any time to try your recipe, check to see if your recipe calls for ½ cup of boiled water.

Answer format: ending1/ending2/ending3/ending4