When the high Carbon Monoxide level warning (CO LVL HIGH) is received in the cabin, to what position should the Cabin Vents and Cabin Windows be set? (Ref: POH SEC 3-24)

• A) Both must be CLOSED.
• B) Both must be OPEN.
• C) Vents OPEN, Windows CLOSED.
• D) Vents CLOSED, Windows OPEN.