The open loop transfer function of a unity feedback control system is

1.	The open loop transfer function of a unity feedback control system is given by
A.	zero and + 90 , 90
B.	<table><tr><td rowspan="2">-</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td><td rowspan="2"> and + 60 , -60 </td></tr><tr><td style="text-align: center;">3</td></tr></table>
C.	zero and + 120 , 120
D.	<table><tr><td rowspan="2">-</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td><td rowspan="2"> and - 90 , + 90 </td></tr><tr><td style="text-align: center;">3</td></tr></table>
Answer» B. <table><tr><td rowspan="2">-</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td><td rowspan="2"> and + 60 , -60 </td></tr><tr><td style="text-align: center;">3</td></tr></table>

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The open loop transfer function of a unity feedback control system is given by

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