If $\mu_0$ is the permeability of vacuum and $\chi_m$ is the magnetic susceptibility,then the permeability of the material $\mu$ is . . . . . . .
- A$\mu=\mu_0(1+\chi_m)$
- B$\mu=\mu_0(\chi_m-1)$
- C$\mu=\mu_0(1-\chi_m)$
- D$\mu=\mu_0(1+\chi_m)$
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