what is D.F of electic flux

Electric flux is defined as the $\frac{1}{{\epsilon }_o}$ times to the total charge enclosed by the object.
Mathematically:
$\oint E.ds = \frac{q}{{\epsilon }_o}$
SI unit of electric flux = Nm²C^-1
Dimensional formula for electric flux = [M¹L³T^-3A^-1]