Identify $\underline A$ and $\underline B$ in the following reaction:

Question

A	B
(1) $HI+Red \;P$ (2) $Ni/ \Delta$ (3) $LiA/H_4$ (4) $Pd -BaSO_4$	$LiA/H_4$ $LiA/H_4$ $HI+Red \;P$ $Zn+HCl$