The velocity of electromagnetic radiation in a medium of permittivity $\epsilon_0$ and permeability $\mu_0$ is given by :

Question

( A ) " $\frac{1}{\sqrt{\mu_0\epsilon_0}}$"
( B ) $\sqrt{\frac{\mu_0}{\epsilon_0}}$
( C ) $\sqrt{\frac{\epsilon_0}{\mu_0}}$
( D ) $\sqrt{\mu_0\epsilon_0}$