In the circuit below, (W/L)1 = 100, (W/L)2 = 400, ID = 2.5 mA. a. What are the functions of M1 and M2 (i.e., amplifier, topology, current source, or diode-connected load)? b. If λ = 0, RL = ∞, determine the voltage gain Av. c. If λ = 0, RL = 400 Ω, determine the voltage gain Av. d. If λ = 0.1 V−1, RL = 400 Ω, determine the voltage gain Av.