If the distance between the foci and the distance between the two directricies of the hyperbola $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ are in the ratio 3:2, then $b:a$ is (a)$1:\sqrt{2}$ (b) $\sqrt{3}:\sqrt{2}$ (c)$1:2$ (d) $2:1$

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