Please choose the correct solution to the question: How to change a tire on a vehicle.

Solution1: First place jack under  vehicle, remove lugnuts, remove tire, put on new tire and tighten lugnuts, then lower car.

Solution2: First place jack under and raise vehicle off ground, remove lugnuts, remove tire, put on new tire and tighten lugnuts, then lower car.

Answer format: solution1/solution2