When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

• A. <img src="/_files/images/mechanical-engineering/machine-design/562-74-1.png">
• B. <img src="/_files/images/mechanical-engineering/machine-design/562-74-2.png">
• C. <img src="/_files/images/mechanical-engineering/machine-design/562-74-3.png">
• D. <img src="/_files/images/mechanical-engineering/machine-design/562-74-4.png">