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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 $K$