The Laplace transform of the signal ( int_0^t e^{-3t} ) cos 2t dt is _____________

• A. ( frac{-(s+3)}{s[(s+3)^2+4]} )
• B. ( frac{(s+3)}{s[(s+3)^2+4]} )
• C. ( frac{s(s+3)}{(s+3)^2+4} )
• D. ( frac{-s(s+3)}{(s+3)^2+4} )