What is the correct answer?
4
A. π (r₁ + r₂) + (r₁ + r₂)²/x + 2x
B. π (r₁ + r₂) + (r₁ - r₂)²/x + 2x
C. π (r₁ - r₂) + (r₁ - r₂)²/x + 2x
D. π (r₁ - r₂) + (r₁ + r₂)²/x + 2x
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