Finding Velocity From Position Function

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The position of a particle is given by the function $s(t)=t^4-4*t^2+7$ . Which of the following is the velocity function $v(t)$ ?

$4*t^3-8*t$

$3*t^3-4*t^2$

$4*t^2-8*t+7$

$t^4-8*t$

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