Minimum depth of a footing carrying a heavy load, is calculated by the formula

• A. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/42-11-178-1.png">
• B. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/42-11-178-2.png">
• C. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/42-11-178-3.png">
• D. <img src="/_files/images/civil-engineering/soil-mechanics-and-foundation-engineering/42-11-178-4.png">