Coordination Compounds

Which of the coordination compounds [(i) to (v)] are used for the following processes :

A: Electroplating

B: Removal of excess copper from human body

C: Estimation of hardness of water

(i) DMG
(ii) $\mathrm{Na}_2 \mathrm{EDTA}$
(iii) Cis-platin
(iv) D-penicillamine
(v) $\mathrm{K}\left[\mathrm{Au}(\mathrm{CN})_2\right]$