For the band gap reference shown above M1, M2, and M3 are identical. a. We size one BJT n times the other BJT. Which one should be larger and why? If the larger BJT has an area of nA then its saturation current is nIs of the smaller BJT (with an area of A and saturation current of Is) b. The OPAMP should be in negative feedback for the circuit to function properly. Explain that the OPAMP is in negative feedback in the shown configuration. c. Find the output voltage Vout.