Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) Which one of the following complex ions has geometrical isomers - Sarthaks eConnect

Which one of the following complex ions has geometrical isomers

`[Co(en)_3]^(3+)`

`[Ni(NH_3)_5Br]^+`

`[Co(NH_3)_2(en)_2]^(3+)`

`[Cr(NH_3)_4(en)]^(3+)`