What is the angular impulse applied to a rotating object if its angular momentum changed from $1\mathrm{.}2$ to $0\mathrm{.}4kg*\frac{m^2}{s}.$

$0\mathrm{.}8$

$0\mathrm{.}48$

$-1\mathrm{.}6$

$-0\mathrm{.}8$