Please help me with this

Dear student,

Ag I AgCl(s), KCl II KBr , AgBr (s)  I Ag

​​​​​​The reaction at anode can be written as: (Ag I AgCl (s) )
Ag --> Ag⁺ + e- 
Ag is in 0 oxidation state , it is getting oxidised to +1 in Ag⁺

The reaction at cathode can be written as: ( AgBr (s) I Ag) 
Ag⁺ + e^- --> Ag 

​​​Ag⁺ is in +1 oxidation state, it gets reduced to 0 in Ag.
The electrode at which oxidation occurs is Anode. Hence the correct option is 1)  Ag I AgCl.

Regards