Correct option is A
Built-up Area:
It is the carpet area plus the area that is covered by the exterior and inner walls, balcony, exterior staircase, and other liveable areas if any. In housing apartments in India, nearly 30% of a housing unit's entire area is used in creating the inner wall and the balconies.
Built-up Area = Carpet Area + Walls Area + Terrace and Balcony + Exclusive Corridor
Plinth Area:
The built-up covered area of a building is measured at the floor level of any story and is the entire area occupied by the building including internal and external walls and not including the balcony. The plinth area is 10 to 20% greater than the carpet area.
