Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make organic yogurt [title] Gradually heat the milk. [step] In order to make the milk safe to drink, you must first heat it to 180 degrees fahrenheit (82 degrees celsius). Pour the goat's milk into a small to medium sauce pot and heat over low to medium-low heat until it reaches the appropriate temperature, stirring often to avoid scalding it by mistake.

Ending1: If you have trouble the milk softens, simply lower the heat or reduce the heat to medium-low. If it starts to melt or become thick, lower the heat. Ending2: [substeps] Avoid over heating, which could result in burning or melting the milk. Constantly stirring the milk will cause it to boil over and produce a mess. Ending3: Do not allow the milk to boil, since the proteins can be damaged at boiling temperatures. [title] Remove the warm milk from the stove. Ending4: [substeps] Let the milk cool to room temperature before adding it to the saucepan. Always cool milk quickly after adding it to the saucepan.

Answer format: ending1/ending2/ending3/ending4