Which of the following complexes are heteroleptic ?

Which of the following complexes are homoleptic ?

Which of the following complex is heteroleptic ?

Which of the following complex is heteroleptic type?

Which of the following complex is heteroleptic as well as unable to show geometrical isomerism [Co(NH3)6]Cl3 [Co(NH3)3]Cl3 [Co(NH3)5]Cl2 [Co(en2)Cl2]Cl