Problem $14.$ Output Response for a Feedback Control System

A feedback control system has the following transfer functions $G_1(s)$ and $G_2(s).$

Which output response Y$($s$)$ has the correct form for this system?

$G_1(s)=\frac{K_1}{{}_{1}s+1}$

$G_2(s)=\frac{K_2}{{}_{2}s+1}$

$($A$)Y(s)=\frac{(\frac{K_2}{{}_{2}s+1})((\frac{K_1}{{}_{1}s+1})R(s)+L(s))}{1+(\frac{K_1}{{}_{1}s+1})(\frac{K_2}{{}_{2}s+1})H(s)}$

$($B$)Y(s)=\frac{(\frac{K_1}{{}_{1}s+1})((\frac{K_2}{{}_{2}s+1})R(s)+1)}{1+(\frac{K_1}{{}_{1}s+1})(\frac{K_2}{{}_{2}s+1})H(s)L(s)}$

$($C$)Y(s)=\frac{(\frac{K_1}{{}_{1}s+1})((\frac{K_2}{{}_{2}s+1})R(s)+L(s))}{1-(\frac{K_1{K}_2}{{}_1{}_2+1})H(s)}$

$($D$)Y(s)=\frac{(\frac{K_1}{{}_{1}s+1})(\frac{K_2}{{}_{2}s+1})R(s)+L(s)}{1+(\frac{K_2}{{}_{2}s+1})H(s)}$