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According to maximum shear stress theory, the maximum shear stress in the shaft is

A. (1/2) × √(σ² + 4τ²)

B. √(σ² + 4τ²)

C. (1/2) × [σ + √(σ² + 4τ²)]

D. σ + √(σ² + 4τ²)

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