Which of the following pairs of cations cannot be separated by using an \( \mathrm{NH}_{3} \) so...

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Which of the following pairs of cations cannot be separated by using an \( \mathrm{NH}_{3} \) solution ?
(a) \( \mathrm{Pb}^{2+}, \mathrm{Zn}^{2+} \)
(b) \( \mathrm{Pb}^{2+}, \mathrm{Cu}^{2+} \)
(c) \( \mathrm{Zn}^{2+}, \mathrm{Cu}^{2+} \)
(d) \( \mathrm{Al}^{3+}, \mathrm{Ag}^{+} \)
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