The magnetic susceptibility of the material of a rod is $499$. Permeability of vacuum is $4 \pi \times 10^{-7} \ H/m$. The absolute permeability of the material of the rod in $H/m$ is:
- A$\pi \times 10^{-4}$
- B$2 \pi \times 10^{-4}$
- C$3 \pi \times 10^{-4}$
- D$4 \pi \times 10^{-4}$
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