Which of the following combinations has the dimension of electrical resistance? (Here,$\varepsilon_0$ is the permittivity of vacuum and $\mu_0$ is the permeability of vacuum.)

• A
  $\sqrt {\frac{{\varepsilon _0}}{{\mu _0}}} $
• B
  $\frac{{\mu _0}}{{\varepsilon _0}}$
• C
  $\frac{{\varepsilon _0}}{{\mu _0}}$
• D
  $\sqrt {\frac{{\mu _0}}{{\varepsilon _0}}} $