Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than____________?

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Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than____________?

A. 42 diameters from the centre of the column
B. 42 diameters from the inner edge of the column
C. 42 diameters from the outer edge of the column
D. 24 diameters from the centre of the column