The root locus of a unity feedback system is shown in the above figure. The open-loop transfer function is given by

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

1.	The root locus of a unity feedback system is shown in the above figure. The open-loop transfer function is given by
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K</center></td></tr><tr><td style="text-align: center;"> s (s + 1) (s + 2)</td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 1)</center></td></tr><tr><td style="text-align: center;">s (s + 2)</td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 2)</center></td></tr><tr><td style="text-align: center;">s (s + 1)</td></tr></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>Ks</center></td></tr><tr><td style="text-align: center;">(s + 1)(s + 2)</td></tr></table>
Answer» D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>Ks</center></td></tr><tr><td style="text-align: center;">(s + 1)(s + 2)</td></tr></table>

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The root locus of a unity feedback system is shown in the above figure. The open-loop transfer function is given by

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