Select the correct option to test your answer: A $$\frac{\pi }{4}{{\text{d}}^2}{\sigma _{\text{t}}}$$ B $$\frac{\pi }{4}{{\text{d}}^2}\tau $$ C $$\frac{\pi }{2}{{\text{d}}^2}{\sigma _{\text{t}}}$$ D $$\frac{\pi }{2}{{\text{d}}^2}\tau $$ Correct Answer: Option D ($$\frac{\pi }{2}{{\text{d}}^2}\tau $$) Verified correct option for Mechanical Engineering (Strength Of Materials In Me).