The signal flow graph for a system is given below. The transfer function $\dfrac{Y(s)}{U(s)}$ for this system is

1. $\frac{s+1}{5s^{2}+6s+2} \\$
2. $\frac{s+1}{s^{2}+6s+2} \\$
3. $\frac{s+1}{s^{2}+4s+2} \\$
4. $\frac{1}{5s^{2}+6s+2}$
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