If f(t) = cos(at + b), its Laplace transform is given by?

• A. ( frac{a}{s^2+a^2} )
• B. ( frac{2as}{(s^2+a^2)^2} )
• C. ( frac{scos(b)-asin(b)}{s^2+a^2} )
• D. Does not exist