\({\rm{G}}\left( {\rm{s}} \right){\rm{H}}\left( {\rm{s}} \right) = \frac{{{\rm{K}}\left( {{\rm{s}} + 3} \right)\left( {{\rm{s}} + 6} \right)}}{{{\rm{s}}\left( {{\rm{s}} + 2} \right)}}\) . The centroid of the asymptotes in root-locus will be _____.
1
0
2
1
3
2
4
centroid does not exist