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The inverse Laplace transform of the function

$\frac{s+5}{(s+1)(s+3)}$ is

1. $2 e^{-t}-e^{-3 t}$
2. $2 e^{-t}+e^{-3 t}$
3. $e^{-t}-2 e^{-3 t}$
4. $e^{-t}+e^{-3 t}$