#$1-$ NMOS Circuits Under DC Conditions $(10$ points$)$

The NMOS in the circuit to the left has a MOSFET parameter ${}_n{C}_{ox}(\frac{W}{L})=311\frac{A}{V^2},$ and $V_{tn}=0\mathrm{.}8V.$ Find the following:

$($a$)$ The values of $R_D$ and $R_S$ needed to establish a drain voltage $V_D=3\mathrm{.}0V.$

$($b$)$ The resulting drain current $I_D$