Please choose the correct solution to the question: Use the freezer for keeping milk

Solution1: Place the milk in your freezer in its original plastic container or glass freezer-safe container.    Make sure to make the lid of the milk very tight to allow the milk to expand, so remove some milk if needed.    When you're ready to use the frozen milk, allow it to thaw in the fridge.

Solution2: Place the milk in your freezer in its original plastic container or glass freezer-safe container.    Make sure to leave room to allow the milk to expand, so remove some milk if needed.    When you're ready to use the frozen milk, allow it to thaw in the fridge.

Answer format: solution1/solution2
Answer: solution2