F : The unit impulse response of a second order system is $\frac{1}{6}{e}^{-0\mathrm{.}8t}sin(0\mathrm{.}6t).$ The natural frequency and damping ratio of this system are, respectively

$1$ and $0\mathrm{.}8$

$2$ and $0\mathrm{.}3$

$0\mathrm{.}6$ and $0\mathrm{.}8$

$1$ and $0\mathrm{.}6$

$2$ and $0\mathrm{.}4$