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Which of the following will show optical...

Which of the following will show optical isomers?
(I) cis-`[Co(NH_(3))_(2)(en)_(2)]^(3+)`
(II) trans-`[IrCl_(2)(C_(2)O_(4))_(2)]^(3-)`
(III) `[Rh(en)_(3)]^(3+)`
(IV) cis-`[IR(H_(2)O)_(3)Cl_(3)]`

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