If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by
A. D = 0.00775 $${\text{a}}\sqrt {\text{P}} $$
B. D = 0.0775 $${\text{a}}\sqrt {\text{P}} $$
C. D = 0.07775 $${\text{a}}\sqrt {\text{P}} $$
D. D = 0.775 $${\text{P}}\sqrt {\text{a}} $$
Answer: Option A

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