Which of the following is the correct nature of shear stress distribution along the cross section in a horizontal circular pipe under steady state fluid flow condition ?

• A. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/760-839-1.png">
• B. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/760-839-2.png">
• C. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/760-839-3.png">
• D. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/760-839-4.png">