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Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of_______________?

Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of_______________?

A. 0.1 L from the outer edge of column
B. 0.1 L from the centre edge of column
C. Half the distance of projection
D. One -fourth the distance of projection