Please choose the correct solution to the question: How do you whistle?

Solution1: Wet your lips and pucker slightly. With your mouth slightly open, place your tongue on the roof of your mouth, just behind your two front teeth. You should hear a high-pitched sound. The more you pucker and the harder you blow, the louder the tone.

Solution2: Wet your lips and pucker slightly. With your mouth slightly open, place your tongue on the roof of your mouth, just behind your two front teeth. You should hear a high-pitched sound. The more you pucker and the softer you blow, the louder the tone.

Answer format: solution1/solution2
Answer: solution1