Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to heat milk [title] Heat it in the microwave. [step] The easiest way to heat milk is in the microwave, but you'll have to keep an eye on it. One cup (250 ml) of milk should reach room temperature within 45 seconds and boil within two and a half minutes.

Ending1: Stir it every 15 seconds to keep it from boiling over. [substeps] You can also try setting your microwave to 70 percent power for a slower boil. Ending2: Make sure you are constantly ensuring that the milk is heating evenly. [substeps] If you don't own a microwave, you can set the temperature to 2.5 or higher, regardless of the brand of milk. Ending3: [title] Add milk if a recipe calls for it. [step] The heat from the microwave will burn some milk, so you may want to use a different type of milk if you're concerned about it burning. Ending4: [substeps] For best results, use open-ended milk jugs. Open-ended jugs will give you the smoothest results, but at some point the milk will become slushy.

Answer format: ending1/ending2/ending3/ending4