For a `d^4` metal ion in an octahedral field, the correct electronic configuration is :

the correct electronic configuration of Cu^(2+) ion is

The correct electronic configuration of a chloride ion is :

If Delta_0 lt P , the correct electronic configuration for d^4 system will be

among the following series of transition metal ions, the one where all ions have some 3d electronic configuration is

Among the following series of transition metal ions, the one where all metal ion have the sae 3d electronic configuration is