If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration is
A:$$ D =\frac {W (a - b)}{4a^{2} bq} $$
B:$$ D =\frac {W (a^2 - b^2)}{4a^{2} bq} $$
C:$$ D =\frac {W (a^2 - b^2)}{8a^{2} bq} $$
D:$$ D =\frac {W (a^2 - b^2)}{4abq} $$
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