Which complex is an example of MA4BC (or MA2BC) type diastereoisomers

1. A.
   $\left\lbrack Co(en)_{2}{Cl}_{2} \right\rbrack^{+}$
2. B.
   $\left\lbrack Pt\left( {NH}_{3} \right)\left( H_{2}O \right){Cl}_{2} \right\rbrack$
3. C.
   $\ Pt\left( {NH}_{3} \right)_{2}{Cl}_{2}$
4. D.
   $\left\lbrack Co\left( {NH}_{3} \right)_{4}{Cl}_{2} \right\rbrack^{+}$

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1. A.
   $[\mathrm{Pt(NH_3)(H_2O)Cl_2}]$
2. B.
   $[\mathrm{Pt(NH_3)_4ClBr}]^{2+}$
3. C.
   $\mathrm{Pt(NH_3)_2Cl_2}$
4. D.
   $[\mathrm{Co(NH_3)_4Cl_2}]^+$

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