The thickness 't' of a rectangular column base which is provided for distributing the load uniformly, is calculated from the formula

• A. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-111-1.png">
• B. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-111-2.png">
• C. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-111-3.png">
• D. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-111-4.png">