Pick up the correct statement regarding the centre line method of estimating a building?

Estimating and Costing 20/08/2020

A. Product of the centre line of the walls and area of cross-section of any item, gives total quantity of the item
B. The centre line is worked out separately for different sections of walls of a building
C. The centre line length is reduced by half the layer of main wall joining the partition wall
D. All the above

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