A linear time invariant (LTI) system with the transfer function
$$G(s)=\frac{K(s^{2}+2s+2)}{(s_{2}-3s+2)}$$
is connected in unity feedback configuration as shown in the figure.
For the closed loop system shown, the root locus for $0< K < \infty$ intersects the imaginary axis for $K=1.5$. The closed loop system is stable for
- $K>1.5$
- $1<K<1.5$
- $0<K<1$
- no positive value of $K$