The inverse Laplace transform of $H(s)=\frac{s+3}{s^{2}+2s+1} for \quad t \geq0$
1. $3te^{-t}+e^{-t}$
2. $3e^{-t}$
3. $2te^{-t}+e^{-t}$
4. $4te^{-t}+e^{-t}$