The steady state response for an input X(s) = K/s to a system whose transfer function is H(s) in time domain is
$$H(s)=\frac{1}{(s+5)(s+2)}$$

A

$$\frac{K}{10}$$

B

$$e^{-5t} u(t)$$

C

$$e^{-2t} u(t)$$

D

$$(e^{-5t}+e^{-2t}) u(t)$$