Please choose the correct solution to the question: How to plug headphones into a smartphone.

Solution1: Find the 3.5mm jack on the end of the headphone cord. Plug that into the USB port on the phone.

Solution2: Find the 3.5mm jack on the end of the headphone cord. Plug that into the 3.5mm port on the phone.

Answer format: solution1/solution2
Answer: solution2