The Laplace transform of the signal t u(t) * cos 2πt u(t) is _____________

• A. \(\frac{1}{s(s^2+4π^2)}\)
• B. \(\frac{2π}{s^2 (s^2+4π^2)}\)
• C. \(\frac{1}{s^2 (s^2+4π^2)}\)
• D. \(\frac{s^3}{(s^2+4π^2)}\)