Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to change a chain on a mountain bike [title] Secure your bike. [step] It's unlikely that your kickstand will be sufficient for you to get a good look at your bike without it falling over. A bike rack that has hooks from which you can hang your bike works very well, but you can also turn your bike upside down so it rests on the seat and handlebars.

Ending1: Secure the bike bars to the bike rack or slide back in so it runs horizontally, without your turning arm. Use one hand to hold your handlebars and other to grasp the bike bars. Ending2: [substeps] If you don't have a sturdy bike stand, you can put your bike on a chair. You should stand straight up and keep a hand on your seat. Ending3: Having there in mind what type of bike you like, and the types of places you want to ride, it's best to get a bike rack that will help you. [title] Take your bike case out and assemble it. Ending4: [substeps] Inspecting your chain with your bike's wheels facing upwards will make it more comfortable for you to inspect and work on. You can make a simple bike rack with scrap parts.

Answer format: ending1/ending2/ending3/ending4