Two circles C₁ and C₂ touch each other externally. The radius of C₁ = 16 cm and the radius of C₂ = 8 cm. Find the length (in cm) of their common tangent.

1
\(8 \sqrt{3}\)
2
\(16 \sqrt{3}\)
3
\(8 \sqrt{2}\)
4
\(16 \sqrt{2}\)

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