Which of the following is a ferromagnetic substance? (a) \( \mathrm{Fe}_{2} \mathrm{O}_{3} \) (b...

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Which of the following is a ferromagnetic substance?
(a) \( \mathrm{Fe}_{2} \mathrm{O}_{3} \)
(b) \( \mathrm{Cr}_{2} \mathrm{O}_{3} \)
(c) \( \mathrm{Fe}_{3} \mathrm{O}_{4} \)
(d) \( \mathrm{CrO}_{2} \)
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