Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make shortbread [title] Prepare the oven. [step] Preheat the oven to 160ºc (320ºf) and place a rack in the center position. [title] Add cool butter to a mixing bowl.

Ending1: [step] Take 115 g (½ cup) salted butter on the cool side of room temperature, workable but not melting. Cut it into small chunks and add to a mixing bowl. Ending2: [step] In a small saucepan, cream the butter with the purpose of the recipe, beating it into the butter with a hand mixer. [title] Add the milk, granulated sugar, and vanilla. Ending3: [step] After placing the dough, start piling-adding a few pinches of salt to the bowl with the dough. [title] Mix the flour, baking powder, baking soda, and salt. Ending4: [step] Melt the butter and set the bowl aside. [title] In a separate mixing bowl, cream the butter and shortening.

Answer format: ending1/ending2/ending3/ending4