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Which of the following pairs of cations can be separated by adding \( \mathrm{NH}_{4} \mathrm{Cl} \) and \( \mathrm{NH}_{4} \mathrm{OH} \) to the mixture?
(a) \( \mathrm{Fe}^{3+}, \mathrm{Al}^{3+} \)
(b) \( \mathrm{Cr}^{3+}, \mathrm{Ni}^{2+} \)
(c) \( \mathrm{Al}^{3+}, \mathrm{Cr}^{3+} \)
(d) \( \mathrm{Fe}^{3+}, \mathrm{Cr}^{3+} \)
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