5.45 The NMOS transistor in the circuit of Fig. P5.44 has Vt = 0.4 V and k n = 4 mA/V2. The voltages at the source and the drain are measured and found to be −0.6 V and +0.2 V, respectively. What current ID is flowing, and what must the values of R D and RS be? What is the largest value for R D for which ID remains unchanged from the value found?