The relation between the permittivity of free space $(\epsilon_0)$, the permeability of free space $(\mu_0)$, and the speed of light $(c)$ is:

• A
  $\epsilon_0 \mu_0 = \frac{4 \pi}{c^2}$
• B
  $\epsilon_0 \mu_0 = \frac{1}{c^2}$
• C
  $\epsilon_0 \mu_0 = \frac{1}{c}$
• D
  $\epsilon_0 \mu_0 = c^2$