Please choose the correct solution to the question: how to make hot chocolate

Solution1: Combine the cocoa, sugar, water, and salt in a medium saucepan, then over medium heat, stir constantly until the mixture boils. Cook, stirring constantly for 1 minute.    Stir in the water and heat, but do not boil.    Remove from the heat and add vanilla; stir well. Serve immediately.

Solution2: Combine the cocoa, sugar, water, and salt in a medium saucepan, then over medium heat, stir constantly until the mixture boils. Cook, stirring constantly for 1 minute.    Stir in the milk and heat, but do not boil.    Remove from the heat and add vanilla; stir well. Serve immediately.

Answer format: solution1/solution2
Answer: solution2