For Figure 4, the mid-frequency unloaded amplifier gain K = 10^3, input resistance ri = 25 kOhm, and output resistance r0 = 5 kOhm. A) What is the type of feedback? Describe. B) Determine the feedback circuit and calculate the feedback value (B), input resistance riB, and output resistance roB of the feedback circuit. C) Calculate the voltage gain V0/Vg.