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

Question

( A ) $\mu_d=0\; and\; \mu_p\neq0$
( B ) $\mu_p=0\; and \;\mu_f\neq0$
( C ) $\mu_d\neq0 \;and\;\mu_f\neq0$
( D ) $\mu_d\neq0 \;and\; \mu_f=0$