When a fan is turned off, it's angular speed decreases from $8$rads to $4$rads in $2\mathrm{.}0$ seconds. What is the magnitude of the average angular acceleration, $,$ of the fan?

Group of answer choices

$6$rads$2$

$2$rads$2$

$8$rads$2$

$4$rads$2$

$1$rads$2$

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