Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make royal icing [title] Gather your ingredients. [step] Here's what you'll need to make about four cups of royal icing with egg whites : [substeps] 3 cups (700 ml) powdered sugar, plus additional as necessary 2 egg whites 1 tsp (5 ml) lemon juice [title] Sift the powdered sugar into a bowl. [step] Sifting is not necessary but will help keep your icing from getting lumpy.

Ending1: [title] Separate the egg whites into a separate bowl. [step] Crack an egg and then turn it crack-side up. Ending2: [substeps] If you're using lemon juice, be sure to scrape the powdered sugar into a fine sieve first. The clouds will help the icing stay together. Ending3: When well mixed, whisk together the sugar and egg whites in a small bowl. You will end up with a thick, smooth, and consistent icing. Ending4: [title] Whisk all of the ingredients except the egg whites in a non-rubber bowl. [step] You'll get better results by using this method.

Answer format: ending1/ending2/ending3/ending4