Find the Fourier transform of f(t)=te-at u(t).

• A. \(\frac{1}{(a-jω)^2} \)
• B. \(\frac{1}{(a+jω)^2} \)
• C. \(\frac{a}{(a-jω)^2} \)
• D. \(\frac{ω}{(a-jω)^2} \)