In the reaction, $I_{2 }+2KCl{O}_3\to {\text{2KIO}}_{\text{3}} +{\text{ Cl}}_{\text{2}}$

i)  Iodine is oxidised                           ii) Chlorine is reduced         

iii) Iodine displaces chlorine            iv) $KCl{O}_3$  is decomposed

The correct combination is