Match List 1 and List 2, (the basis of matching being complex formation in qualitative or quantitative analysis of ions) and select the correct answer using the codes given below the lists.
`{:(List I,,,,List2),(Ions i nvolved,,,,Compl ex i ng ag ent),(a. Ni^(2+),,,,1.EDTA),(b. Zn^(2+),,,,2. Sodium nitroprussi de),(c. Cu^(2+),,,,3. Ammonia),(d. S^(2-),,,,4. Dimethylglyo x ime):}`
Codes: