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The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is

A. (1/2). μ W cosec α (r₁ + r₂)

B. (2/3).μ W cosec α (r₁ + r₂)

C. (1/2). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]

D. (2/3). μ W cosec α [(r₁³ - r₂³)/(r₁² - r₂²)]

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