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What is the correct answer?

4

M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is

A. π/64 (D4 + d4)

B. π/32 (D4 - d4)

C. π/32 (D4 + d4)

D. π/32 (D4 × d4)