Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to create a battery from a lemon [title] Gather your materials. [step] To make a lemon battery you will need a copper penny, a galvanized nail, a lemon (10 total), a knife, and a voltmeter. Adult supervision is recommended, especially while handling the knife.

Ending1: [substeps] Copper penny works as both a weed-cover for sugarless objects, and a smaller power source for opaque objects like planters and shrubs. The copper penny can be set aside later to make a battery at home. Ending2: Rinse the penny with a light detergent to ensure you are working with a clean surface. Any lemon will do, but a lemon with a thinner rind will make a better battery. Ending3: [substeps] You can try taking five lemons and attaching the hook end of each lemon to the red metal terminal on a voltmeter. The battery is powered by the red metal terminal on the voltmeter. Ending4: [title] Get the lemon and sharpen the copper penny by slipping over the pointy side of the copper penny. [step] This will prevent the copper penny from sticking to your hands.

Answer format: ending1/ending2/ending3/ending4