The parameters of transistor in Fig. 6.17(a) are $K_n = 6.5 \text{ mA/}V^2$, $V_t = 0.5 \text{ V}$, $i_D = 1 \text{ mA}$, $R_D = 2.5 \text{ k}\Omega$, and $V_{DD} = 5 \text{ V}$. Determine a) the gate-source voltage, $V_{GS}$, b) the drain-source voltage, $V_{DS}$, and c) the voltage gain $A_v$ at the Q-point.