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

• A. (Area of the column A ‚àö√≥ Safe punching stress)/Load on column A
• B. (Perimeter of column A ‚àö√≥ Safe punching stress)/(Load on column A + Upward pressure ‚àö√≥ Area of the column)
• C. (Perimeter of column A ‚àö√≥ Safe punching stress)/(Load on column A ‚àö√≥ Upward pressure ‚àö√≥ Area of the column)
• D. None of these