Identify an unbounded input from inputs whose transfer functions are given below
A
1
B
$$\frac{1}{{\text{S}}}$$
C
$$\frac{1}{{{{\text{S}}^2}}}$$
D
$$\frac{1}{{{{\text{S}}^2} + 1}}$$
Correct Answer: $$\frac{1}{{{{\text{S}}^2}}}$$