Oxidation number of $Cl$ in $CaOCl_2$ (bleaching power) is :
( A ) $+1$ and $-1$ since it contains $ClO^-$ and $Cl^-$
( B ) $-1$, since it contains $Cl^-$
( C ) $+1$, since it contains $ClO^-$
( D ) zero, since it contains $Cl_2$