What type of HVAC system is characterized by a having a split supply air stream, with one for cold air and the other for hot air?

Correct Answer: Option B — A dual duct system

Dual duct systems utilize two separate supply air streams, one heated and one cooled, which are mixed at the terminal unit to achieve the desired zone temperature. This configuration allows for precise individual room control by modulating the ratio of hot and cold air delivered to each specific space.