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The ratio of the mobility to the diffusion coefficient in a semiconductor has the units

1. $\mathrm{V}^{-1}$
2. $\mathrm{cm} \cdot \mathrm{V}^{-1}$
3. $\mathrm{V} \cdot \mathrm{cm}^{-1}$
4. $\mathrm{V} \cdot \mathrm{s}$