Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make thumbprint cookies [title] Place the butter, sugar and vanilla extract in a large mixing bowl. [step] Beat the ingredients together with a handheld mixer or a stand mixer with a paddle attachment, mixing on medium speed for about 2 minutes. [title] Pour the flour and salt into a sifter or a sieve.

Ending1: [step] Ensure that you do not spill the flour as you add it. If there are any solids in the mixture, gently shake them out. Ending2: [step] How much you add will depend on how thick your dough is. If it is hard, or you want extremely thick cookies, add just a tiny bit. Ending3: [step] Do not have an electric mixer, as these will do the job. [title] Add the oil, if you don't have one. Ending4: [step] Either crank the sifter over a second mixing bowl or tap the sieve so that the flour and salt sift through the mesh and into the bowl. [title] Add 1 cup of the sifted dry ingredients into the butter mixer, mixing on low speed until just combined.

Answer format: ending1/ending2/ending3/ending4