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Which of the following will have three stereoisomeric forms?
(i) \( \left[\mathrm{Cr}\left(\mathrm{NO}_{3}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right] \)
(ii) \( \dot{\mathrm{K}}_{3}\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right] \)
\( \mathrm{P} \)
(iii) \( \mathrm{K}_{3}\left[\mathrm{CoCl}_{2}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{2}\right] \)
(iv) \( \left[\mathrm{CoBrCl}(\mathrm{en})_{2}\right] \)
W
(a) (iii) and (iv)
(b) (i), (iii) and (iv) (c) (iv) only
(d) All four
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