If the arithmetic mean of two positive numbers is $A$,their geometric mean is $G$,and their harmonic mean is $H$,then $H$ is equal to:
- A$\frac{G^2}{A}$
- B$\frac{G}{A^2}$
- C$\frac{A^2}{G}$
- D$\frac{A}{G^2}$
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