Please choose the correct solution to the question: How do you keep the heat from a fire inside a primitive shelter?

Solution1: Build a stone wall behind the fire so that the exposed side of the fire is still facing you, this will reflect the heat back into the shelter.

Solution2: Dig a hole in the middle of your shelter so that the heat will rise and keep the heat in the shelter instead of drifting into the wind.

Answer format: solution1/solution2
Answer: solution1