Assign $A, B, C, D$ from the given type of reaction.
$I_2 + 2NaOH \longrightarrow NaI + NaOI + H_2O$

• A
  $A$. For disproportionation reaction.
• B
  $B$. For comproportionation reaction.
• C
  $C$. For either intermolecular redox reaction or displacement reaction.
• D
  $D$. For either thermal combination redox reaction or thermal decomposition redox reaction.