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Some unknown material has a conductivity of $10^{6}$ $\mathrm{mho} / \mathrm{m}$ and a permeability of $4 \pi \times 10^{-7} \mathrm{H} / \mathrm{m}$. The skin depth for the material at $1 \mathrm{GHz}$ is

- $15.9 \mu \mathrm{m}$
- $20.9 \mu \mathrm{m}$
- $25.9 \mu \mathrm{m}$
- $30.9 \mu \mathrm{m}$