Out of the following complex ions, identify heteroleptic complexes:

A. [Co(NH₃)₅(CO₃)]⁺

B. [Co(NH₃)₄Cl₂]⁺

C. [Co(NH₃)₆]³⁺

D. [CoCl₂(en)₂]⁺

E. [Co(en)₃]⁺

Choose the correct answer from the options given below:

A, B, D only

[Co(NH₃)₅(CO₃)]⁺ , [Co(NH₃)₄Cl₂]⁺ , [CoCl₂(en)₂]⁺ are heteroleptic complexes as the ligands which are attached to central metal atom are different.

[Co(NH₃)₆]³⁺ ,[Co(en)₃]+ are homoleptic complexes as the ligands which are attached to central metal atom are same.