The transfer function V(s) /I(s) in the signal flow graph shown in the

1.	The transfer function V(s) /I(s) in the signal flow graph shown in the figure is
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>s<sup>2</sup></center></td></tr><tr><td style="text-align: center;">s<sup>2</sup> + s + 1</td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>s<sup>2</sup> - s - 1</center></td></tr><tr><td style="text-align: center;">s</td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>s</center></td></tr><tr><td style="text-align: center;">s + 1/s</td></tr></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>s</center></td></tr><tr><td style="text-align: center;">s<sup>2</sup> + s + 1</td></tr></table>
Answer» B. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>s<sup>2</sup> - s - 1</center></td></tr><tr><td style="text-align: center;">s</td></tr></table>

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The transfer function V(s) /I(s) in the signal flow graph shown in the figure is

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