Pick Up the Incorrect Statement from the Following

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