Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make chocolate cupcakes with peppermint frosting [title] Preheat oven to 350 ° f (175 ° c). [title] Combine the brown sugar and the butter in a large mixing bowl. [title] Beat with a mixer set at medium speed for two minutes or until well-blended.

Ending1: [title] Put into fridge for about 20 minutes to chill and cool. [title] Pour in the vanilla extract, lemon juice, and egg and stir until well blended. Ending2: [title] Add two tablespoons (22 g) of filling to the large mixing bowl. [title] Mix in the batter with a mixer set at medium-high speed for 10 to 15 minutes or until well blended. Ending3: [title] Gradually add the milk and beat until the mixture thickens, about 2 minutes or until the mixture resembles ice cream. [title] Pipe the frosting onto each cupcake using a greased " cupcake cutter "-each cupcake's cylinder base should be about 2/3 full. Ending4: [title] Add the eggs, one at a time, beating well after each one. [title] Lightly spoon the flour into a dry measuring cup and scrape the flour level with a knife.

Answer format: ending1/ending2/ending3/ending4