Please choose the correct solution to the question: How to make a vodka and soda?

Solution1: Put some ice in a glass. Measure an ounce and a half of vodka in glass. Finish the cocktail with soda.

Solution2: Put some ice in a glass. Measure an ounce and a half of soda in a glass. Finish the cocktail with vodka.

Answer format: solution1/solution2
Answer: solution1