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The values of voltage $\left(\mathrm{V}_{\mathrm{D}}\right)$ across a tunnel-diode corresponding to peak and valley currents are $V_{P}$ and $V_{V}$ respectively. The range of tunnel-diode voltage $V_{D}$ for which the slope of its $I-V_{D}$ characteristics is negative would be

- $\mathrm{V}_{\mathrm{D}}<0$
- $0 \leq \mathrm{V}_{\mathrm{D}}<\mathrm{V}_{\mathrm{P}}$
- $\mathrm{V}_{\mathrm{P}} \leq \mathrm{V}_{\mathrm{D}}<\mathrm{V}_{\mathrm{V}}$
- $\mathrm{V}_{\mathrm{D}} \geq \mathrm{V}_{\mathrm{V}}$