Find the harmonic mean of $a/b$ and $b/a$.
- A$\frac{2ab}{a^2+b^2}$
- B$\frac{2a^2b^2}{a^2+b^2}$
- C$\frac{a^2+b^2}{2ab}$
- D$\frac{2ab}{a+b}$
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