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The signal flow graph of a system is shown below.

The transfer function of the system is

  1. $\frac{s+1}{s^{2}+1}$
  2. $\frac{s-1}{s^{2}+1}$
  3. $\frac{s+1}{s^{2}+s+1}$
  4. $\frac{s-1}{s^{2}+s+1}$
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