The output of a linear system to unit step input u (t) is t2 e2t. The system function H(s) is

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