The unstable system is

1.	The unstable system is
A.	<table><tr><td rowspan="2">G(s) H(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K</center></td><td rowspan="2"> ; K > 0</td></tr><tr><td style="text-align: center;">(T<sub>1</sub>s + 1)(T<sub>2</sub>s + 1)</td></tr></table>
B.	<table><tr><td rowspan="2">G(s) H(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 1)</center></td><td rowspan="2"> ; K > 91</td></tr><tr><td style="text-align: center;">s<sup>2</sup>(s + 4)(s + 5)</td></tr></table>
C.	<table><tr><td rowspan="2">G(s) H(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 2)</center></td><td rowspan="2"> ; K > 2</td></tr><tr><td style="text-align: center;">(s + 1)(s - 3)</td></tr></table>
D.	<table><tr><td rowspan="2">G(s) H(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K</center></td><td rowspan="2"> ; -1 < K < 2</td></tr><tr><td style="text-align: center;">(Ts + 1)<sup>3</sup></td></tr></table>
Answer» C. <table><tr><td rowspan="2">G(s) H(s) = </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>K(s + 2)</center></td><td rowspan="2"> ; K > 2</td></tr><tr><td style="text-align: center;">(s + 1)(s - 3)</td></tr></table>

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