Pick up the incorrect statement from the following _______?

• A. The built up covered area at the floor level of any storey of a building is called plinth area
• B. The usable covered area of the rooms of any storey of a building is called carpet area
• C. The carpet area of a building along with area of its kitchen, pantry, store, lavatory, bath room and glazed veranda, is called floor area
• D. None of these