The transfer function of the system shown below is
1
\(\frac{\text{G}_{1} \text{G}_{2}}{1+\text{G}_{1} \text{G}_{2}+\text{G}_{1} \text{H}_{1}}\)
2
\(\frac{\text{G}_{1} \text{G}_{2}}{1+ \text{H}_{1} \text{G}_{1} \text{G}_{2}}\)
3
\(\frac{ \text{G}_{1} \text{G}_{2}}{1+ \text{G}_{1} \text{G}_{2}+ \text{G}_{1} \text{G}_{2} \text{H}_{1}}\)
4
\(\frac{ \text{G}_{1} \text{G}_{2}}{1+ \text{G}_{1} \text{G}_{2}+ \text{H}_{1}}\)