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Common Data for Questions 50 and 51:
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. $\frac{s-1}{s^{2}+s+1}$