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

• A. <img src="/_files/images/civil-engineering/rcc-structures-design/80-13-140-1.png">
• B. <img src="/_files/images/civil-engineering/rcc-structures-design/80-13-140-2.png">
• C. <img src="/_files/images/civil-engineering/rcc-structures-design/80-13-140-3.png">
• D. None of these.