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The $\text{JFET}$ in the circuit shown in the given figure has an $\mathrm{I}_{\mathrm{DSs}}=10 \mathrm{~mA}$ and $\mathrm{V}_{\mathrm{p}}=5 \mathrm{~V}$. The value of the resistance $\mathrm{R}_{\mathrm{s}}$ for a drain current $\mathrm{I}_{\mathrm{DS}}=6.4 \mathrm{~mA}$ is (select the nearest value)

1. $150 \mathrm{ohms}$
2. $470$ ohms
3. $560$ ohms
4. $1$ kilo ohm.