If the magnetic dipole moment of an atom of diamagnetic material,paramagnetic material and ferromagnetic material are denoted by $\mu_d$,$\mu_p$ and $\mu_f$ respectively,then
- A$\mu_p = 0$ and $\mu_f \neq 0$
- B$\mu_d \neq 0$ and $\mu_p = 0$
- C$\mu_d \neq 0$ and $\mu_f \neq 0$
- D$\mu_d = 0$ and $\mu_p \neq 0$
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