A Silicon PN junction at a temperature of $20^{\circ} \mathrm{C}$ has a reverse saturation current of $10$ picoAmperes $(\mathrm{pA})$. The reverse saturation current at $40^{\circ} \mathrm{C}$ for the same bias is approximately
- $30 \; \mathrm{pA}$.
- $40 \; \mathrm{pA}$.
- $50 \; \mathrm{pA}$
- $60 \; \mathrm{pA}$.