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:$$ D =\frac {W (a^2 - b^2)}{4abq} $$

A

A Only

B

B Only

C

C Only

D

D Only