Please choose the correct solution to the question: how to make icing

Solution1: 3 cups powder sugar    1/3 cup butter, softened    1 1/2 teaspoons vanilla    1 to 2 tablespoons milk     In medium bowl, mix powdered sugar and butter with spoon or electric mixer on low speed. Stir in vanilla and 1 tablespoon of the milk.    Gradually beat in just enough remaining milk to make frosting smooth and spreadable. If frosting is too thick, beat in more milk, a few drops at a time.

Solution2: 3 cups granulated sugar    1/3 cup butter, softened    1 1/2 teaspoons vanilla    1 to 2 tablespoons milk     In medium bowl, mix powdered sugar and butter with spoon or electric mixer on low speed. Stir in vanilla and 1 tablespoon of the milk.    Gradually beat in just enough remaining milk to make frosting smooth and spreadable. If frosting is too thick, beat in more milk, a few drops at a time.

Answer format: solution1/solution2
Answer: solution1