Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to install gas logs [title] Install a carbon monoxide detector in your home. [step] Carbon monoxide is caused when fuels, such as the natural gas used with your gas logs, are not completely burned. Unsafe levels of carbon monoxide cannot be detected by smell or sight and can cause death.

Ending1: Therefore, you need to install a carbon monoxide detector at the foundation of your home (e.g., at the entrance to the furnace room or an office in your building). [substeps] You should also install a carbon monoxide detector on the exterior walls of your home to ensure workers cannot access it. Ending2: [substeps] To find out if you have a carbon monoxide detector in your home, visit this website: http: // www.irs.gov/communities/carbon-monoxide-detectors /. [title] Shop around for the right size fuel tank. Ending3: Keep carbon monoxide detectors out of your home, as they are a great way to ensure that people who use them know what's coming. [substeps] You can hire a pro to install a carbon monoxide detector for your home as a cost-effective way of identifying fuels. Ending4: For your safety, a carbon monoxide detector should be installed in the fireplace room and each bedroom in the home. The detector will be your only warning against unsafe levels of carbon monoxide in the home.

Answer format: ending1/ending2/ending3/ending4