Please choose the correct solution to the question: How to check your car tire's tread condition with a penny.

Solution1: Take a united states penny and hold it face side towards you, then place the top of Lincoln's head into the treads so you can see how much of the penny is obscured by the tread. If part of Lincoln's head isn't always covered by the tread you don't need new tires yet.

Solution2: Take a united states penny and hold it face side towards you, then place the top of Lincoln's head into the treads so you can see how much of the penny is obscured by the tread. If part of Lincoln's head is always covered by the tread you don't need new tires yet.

Answer format: solution1/solution2
Answer: solution2