The output of a linear system for step input is t2e-2t. Then the transfer function is

• A. \(\frac{s}{\left(s + 1\right)^2}\)
• B. \(\frac{2s}{\left(s + 1\right)^3}\)
• C. \(\frac{s}{s^2\left(s + 1\right)}\)
• D. \(\frac{1}{\left(s + 1\right)^3}\)