Consider the points $s_{1}=-3+j 4$ and $s_{2}=-3-j 2$ in the $s$-plane. Then, for a system with the open-loop Transfer function
\[G(s) H(s)=\frac{K}{(s+1)^{4}}\]
- $s_{1}$ is on the root locus,but not $s_{2}$
- $s_{2}$ is on the root locus, but not $s_{1}$
- both $s_{1}$ and $s_{2}$ are on the root locus
- neither $s_{1}$ nor $s_{2}$ is on the root locus.