Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to make watermelon sandwich cookies [title] Combine all of the ingredients for the frosting in a mixing bowl. [title] Beat the ingredients at medium speed with a handheld mixer or a stand mixer with a paddle attachment. [title] Cover the mixing bowl with plastic wrap and place it in the refrigerator until you are ready to assemble the cookies.

Ending1: [title] Grease a 9 x 12-inch (23 x 25 x 24-centimeters) round counter using nonstick cooking spray or wax paper. [title] Pour the icing into the greased baking pan. Ending2: [title] Preheat a griddle or nonstick skillet and spray it with nonstick cooking spray. [title] Whisk the flours, baking powder, baking soda, sugar and salt in a mixing bowl. Ending3: [title] Refrigerate for the amount of time specified on the packages. [title] Place the chocolate chips in a small bowl. Ending4: [title] Preheat your oven to 375ºf (190ºc). [title] Beat the butter until light and fluffy.

Answer format: ending1/ending2/ending3/ending4