The transfer function 0(s) 1(s) of the block diagram is

1.	The transfer function 0(s) 1(s) of the block diagram is
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G<sub>1</sub>G<sub>3</sub>G<sub>4</sub></center></td></tr><tr><td style="text-align: center;">1 + H<sub>1</sub>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub></td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub> + H<sub>2</sub>G<sub>4</sub></center></td></tr><tr><td style="text-align: center;">1 + H<sub>1</sub>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub></td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub> + H<sub>2</sub>G<sub>4</sub></center></td></tr><tr><td style="text-align: center;">1 + H<sub>1</sub>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub> + H<sub>2</sub>G<sub>4</sub>H<sub>1</sub></td></tr></table>
D.
E.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub> + H<sub>2</sub>G<sub>4</sub></center></td></tr><tr><td style="text-align: center;">1 + H<sub>1</sub>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub> + H<sub>1</sub>H<sub>2</sub>G<sub>2</sub>G<sub>3</sub>G<sub>4</sub></td></tr></table>
Answer» D.

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The transfer function 0(s) 1(s) of the block diagram is

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