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For the following system,

when $X_{1} (s) = 0$, the transfer function $\frac{Y(s)}{X_{2}(s)}$ is

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