For the block diagram shown in figure, the transfer function \(\frac{{{C_{\left( s \right)}}}}{{{R_{\left( s \right)}}}}\) is equal to –
1
\(\frac{{{s^2} + 1}}{{{s^2}}}\)
2
\(\frac{{{s^2} + s + 1}}{{{s^2}}}\)
3
\(\frac{1}{{{s^2} + s + 1}}\)
4
\(\frac{{{s^2} + s + 1}}{s}\)