Complementary root locus

Q. The root locus of a unity feedback system is shown in the figure.



The closed-loop transfer function of the system is.

1. $\frac{C\left(s\right)}{R\left(s\right)}=\frac{K}{(s+1)(s+2)}$
2. $\frac{C\left(s\right)}{R\left(s\right)}=\frac{-K}{(s+1)(s+2)+K}$
3. $\frac{C\left(s\right)}{R\left(s\right)}=\frac{K}{(s+1)(s+2)-K}$
4. $\frac{C\left(s\right)}{R\left(s\right)}=\frac{K}{(s+1)(s+2)+K}$