QUESTION 9 5 points Save Answer Consider a unity negative feedback control system, where G(s) is the model of the plant. The phase margin of G(s) is 23 degrees at the gain crossover frequency w (gc)-1 rad/s. We would like to achieve a phase margin of 60 degrees at the gain crossover frequency w_(gc)=1 rad/s. Which of the following compensators can be used to achieve the desired phase margin? It is assumed that all the following compensators can make the closed-loop system stable. 1 + 2 / 2 Gc(s)= 1+2s 1+V2s Gc(s) 1 + 1 / 1+ Ge(s) 2 1+V2s 1+2s Gc(s)= 1+