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

The closed loop transfer function of the system is

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

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