Which would exhibit co-ordination isomerism

Which of the following compound would exhibit co-ordination isomerism?

Which would exhibit ionisation isomerism?

(A): Complexes containing ambidentate ligands exhibit co-ordination isomerism. (R) : Co-ordination isomerism is shown by the compounds in which both cation and anions are complexes.

Assertion: Complexes containing ambidentate ligands exhibit co-ordination isomerism. Reason: Co-ordination isomerism is shown by anionic complexes only.

The comopound which exhibits coordination isomerism is: