The polar plot of the transfer function
\(G\left( s \right) = \frac{1}{{s\left( {Ts + 1} \right)}}\;\)has intersection(s) on (apart from the origin)
1
neither the real axis nor the imaginary axis
2
both the real and imaginary axes
3
the real axis only
4
the imaginary axis only
5
All of the above