Consider the function

$f(t)=1-2t4t^2$

Which of the following gives the relative rate of change $R?$

Select the correct answer below:

$R=100(\frac{8t-2}{1-2t4t^2}).$

$R=100(\frac{1-2t4t^2}{8t-2}).$

$R=\frac{8t-2}{1-2t4t^2},$

$R=\frac{1-2t4t^3}{8t-2}.$