You are coordinating a whole-house remodel that adds a bedroom and a gas furnace. Which combination BEST reflects the required alarm coordination?

Giải thích

Dwellings with fuel-burning appliances or attached garages require carbon monoxide alarms outside each separate sleeping area, and smoke alarms are required in each bedroom and adjacent to sleeping areas. A remodel adding a bedroom and gas furnace triggers both. Option a omits required CO alarms. Option c misplaces the only alarm. Option d wrongly assumes existing homes are exempt when work triggers upgrades.