Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make pinwheel cookies [title] Place the butter in a mixing bowl with the confectioner's sugar. [title] Beat the ingredients at medium speed, using a handheld mixer or a stand mixer with a paddle attachment. [step] The mixture should be pale yellow and smooth in texture when you are done.

Ending1: [title] Mix the flour, baking powder, and salt in a small mixing bowl. [step] All three ingredients should be present at this stage. Ending2: [title] Add the egg and beat the mixture for an additional minute. [title] Add 1/2 cup of the flour and beat the mixture until the flour is just incorporated. Ending3: Beat constantly for about 10 to 20 minutes. [title] Add and mix the wet ingredients in a small bowl. Ending4: [title] Cream the butter and sugar with a stand mixer until light brown and fluffy. [title] Add the yeast and teaspoon in the egg.

Answer format: ending1/ending2/ending3/ending4