Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to be a nascar driver [title] Race go-karts. [step] Many professional race car drivers started at ages as young as 5 behind the wheel of a go-kart. Karting helps teach you the craft of racing, from control to adapting to the race track for speed.

Ending1: You can take the race quiz, online or at the race lines, to familiarize yourself with the races. It's a great way to bond with teammates and hopefully learn a lot about racing through all the questions. Ending2: Pick a race-driven car when you can and make it your first race. Before running a race on a one-mile track, go at it aggressively. Ending3: The earlier you start racing, the better your chances will be for cultivating a career later. Learn as much as you can while racing go-karts. Ending4: If you want to become a nascar driver, you'll have to meet training requirements. Shop around to find one that meets your needs.

Answer format: ending1/ending2/ending3/ending4