#### Answer

$simplifying$.

#### Work Step by Step

Simplifying a rational expression means removing all the common factors in the numerator and denominator.
$\frac{4}{2}$ can be simplified as both numerator and denominators are multiples of 2.
$\frac{4}{2}$ = $\frac{2(2)}{1(2)}$ = $\frac{2}{1}$ ..(Since $\frac{2}{2}$ = 1)