Please choose the correct solution to the question: How to mark all emails as read on gmail

Solution1: On the main screen, find the button that has 3 small circles, lined up vertically. Click that, and then click "Mark all as read"

Solution2: On the main screen, find the button that has 3 small circles, lined up horizontally. Click that, and then click "Mark all as read"

Answer format: solution1/solution2
Answer: solution1