Please choose the correct solution to the question: How can you get rid of dust mites in pillows and bedding?

Solution1: Airing out bedding is even more effective than washing when it comes to killing dust mites, reducing 95.1 percent of their numbers after an overnight stay in air.

Solution2: Freezing bedding is even more effective than washing when it comes to killing dust mites, reducing 95.1 percent of their numbers after an overnight stay in a freezer.

Answer format: solution1/solution2
Answer: solution2