RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
None of these
(Area of the column A × Safe punching stress)/Load on column A

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RCC Structures Design
The spacing of transverse reinforcement of column is decided by the following consideration.

All listed here
Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
The least lateral dimension of the column
Forty-eight times the diameter of transverse reinforcement

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