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Which of the following complexes have a maximum number of unpaired electrons?
(a) \( \left[\mathrm{Ni}(\mathrm{CO})_{4}\right] \)
(b) \( \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{NO}_{2}\right)_{2}\right]^{+} \)
(c) \( \left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-} \)
(d) \( \left[\mathrm{CuBr}_{4}\right]^{2-} \)
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