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

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