Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make root beer float cookies [title] Preheat the oven to 350 ° f (180 ° c). [step] Line 2 baking sheets with parchment paper. [title] Place the butter, granulated sugar and brown sugar in a mixing bowl.

Ending1: [step] Pour in the dry ingredients and whisk until evenly combined. [title] Add the vanilla and cream and whisk the dry ingredients until well-combined. Ending2: [step] Mix until the ingredients are fully combined. [title] Blend in the sugar gradually as it is mixing in until fully incorporated. Ending3: [step] Beat them together on low speed using an electric mixer. Scrape them on the counter to help grind them up more thoroughly. Ending4: [step] Beat the ingredients at medium speed with a handheld mixer or a stand mixer with a paddle attachment. When you're done, the butter mixture should be light and fluffy.

Answer format: ending1/ending2/ending3/ending4