Find vDS for circuits (a) and (b) and find vSD for circuits (c) and (d). In all cases, assume that the NMOS transistors have Vtn = 1 V and Kn = 0.5 mA/V^2. Assume that the PMOS transistors have Vtp = 1 V and Kp = 0.25 mA/V^2. Note that because we use vSG for PMOS transistors, the threshold voltage will be positive.