Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to clean a bicycle chain [title] Secure your bike. [step] A kickstand won't likely be good enough to hold your bike in place while you're working on it. A jostle or a bump could knock your bike on the ground and cause damage.

Ending1: Be sure to secure all parts of your bike before you start on it. [substeps] This will help to prevent damage to the chain. Ending2: Keep your chain secured so it doesn't tip over and potentially cause whatever object is inside your bike to fall if it contacts the ground. Put on an apron or other protective covering before you start working. Ending3: Having your bike firmly grounded will ensure it won't fall off when you begin working on it. If you don't have a kickstand, install a bike stand in your garage if possible. Ending4: You should use a bike stand that securely holds your bike, or you can set your bike upside down on the ground so it rests on the seat and handlebars. [substeps] Having your bike oriented wheels upward is a definite bonus.

Answer format: ending1/ending2/ending3/ending4