Consider the following statements about the oxides of halogens:
$A$. At room temperature,$OF_2$ is thermally stable.
$B$. Order of stability of oxides of halogens is $I > Br > Cl$.
$C$. $I_2O_5$ is used in the estimation of $CO$.
$D$. $ClO_2$ is used as a bleaching agent.
The correct statements are:

• A
  $A$ & $B$ only
• B
  $A$,$B$ & $C$ only
• C
  $B$ & $C$ only
• D
  $A$,$C$ & $D$ only