In the circuit of the figure: Data: VDD = 15 V R1 = 1 kΩ R2 = 1 kΩ R3 = 10 kΩ M1 and M2: k = 0.5 mA/V2 Vt = 3 VID = k(VGS − Vt)2 in saturation Questions: a) Calculate the voltage VGS in the transistor M1. Detail the used calculation procedure. b) Calculate the voltage VDS in M1. c) Justify the operating region in which the transistor M1 is working. d) Calculate the polarization point (ID, VDS) and the operating region of M2. Justify the answer.