Mark the correct labelling of different terms used in coordination compounds :
A. (i) Central atom , (ii) Ionisation sphere , (iii) Coordination number , (iv) Ligands
B. (i) Ligands , (ii) Coordination number , (iii) Valency , (iv Ionisation sphere
C. (i) Ionisation sphere , (ii) Ligands , (iii) Coordination number , (iv) Central atom
D. (i) Ligands , (ii) Ionisation sphere , (iii) Coordination number , (iv) Central atom
