$\mu$ and $\in _0$ denote the permeability and permitting of free space, the dimensions of $\mu_0\in _0$ are

Question

\[(a)\;LT^{-1} \quad (b)\;L^{-2}T^{2} \quad (c)\;M^{-1}L^{-3}Q^2T^2 \quad (d)\;M^{-1}L^{-3}I^2T^2\]