This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to install an exhaust system
Lift the car.
If you don't have a lift, jack up the back end so you can get under it. Use ramps or a jack, whichever you have.

Available options: *If you don't have a jack, dig a hole in the ground on the left side of the car, then take a cricket ball and place it on the ground. Push yourself down over the ball to relieve pressure.. *Be sure to lock the emergency brake and chock at least one wheel that is still on the ground. Make sure to block the car using jack stands, wooden blocks or other sturdy blocks.. *Otherwise, you could get loose gaskets or get hole for your exhaust system. How you then lift the car is entirely up to you.. *Install shock absorbers and drain pipes. Connect the exhaust system to your vehicle..
The answer is:
Be sure to lock the emergency brake and chock at least one wheel that is still on the ground. Make sure to block the car using jack stands, wooden blocks or other sturdy blocks.