The dimensions of (μ_0 _0)^ -1 / 2 are

Options

1. A$\left[\mathrm{L}^{-1} \mathrm{~T}\right]$
2. B$\left[\mathrm{LT}^{-1}\right]$
3. C$\left[\mathrm{L}^{-1 / 2} \mathrm{~T}^{1 / 2}\right]$
4. D$\left[\mathrm{L}^{1 / 2} \mathrm{~T}^{-1 / 2}\right]$