Please choose the correct solution to the question: What can be used as a yeast dough incubator?

Solution1: Fill a hot water bottle with hot water and place it on a pillow. Place your dough bowl  in a plastic bag on top. Cover with a tea towel and a blanket.

Solution2: Fill a water bottle with cold water and place it on a pillow. Place your dough bowl  in a plastic bag on top. Cover with a tea towel and a blanket.

Answer format: solution1/solution2
Answer: solution1