Pick out the WRONG statements about magnetic substances (\(\chi\) = magnetic susceptibility) (\(\mu_r\) = relative permeability).
I. Substances with \(-1 \le \chi<0\) are diamagnetic
II. Substances with \(\chi \gg 1\) are paramagnetic
III. Substances with \(\chi \ll 1\) are ferromagnetic
IV. Substances with \(\mu_r \gg 1\) are ferromagnetic