Please choose the correct ending to complete the given sentence: Health: [header] How to test a carbon monoxide detector [title] Purchase smoke detector tester spray. [step] Canned smoke, also known as smoke detector spray, can also be used to test your carbon monoxide detector. You can find this spray at most home improvement stores, or you can purchase it online.

Ending1: [substeps] Wear protective gloves while using the spray. Do not touch any of the metal parts of the detector while it is in use. Ending2: One can costs between $5-$10 usd and will usually last for a few years. [substeps] Canned smoke is an extremely flammable aerosol and should be kept out of sunlight or temperatures above 122 ° f (50 ° c). Ending3: These can be purchased at most home improvement stores and often come with detailed instructions regarding which kind of detector to use in your home. [substeps] Canned smoke draws more carbon into the air, so it's important to be familiar with how to prevent carbon poisoning. Ending4: [substeps] Canned smoke comes in four different colors: light, medium, and dark. Spray of the style you will use typically gets a light color and it typically stays dark when smoking.

Answer format: ending1/ending2/ending3/ending4