Organic reaction please answer my questions as soon as possible

here nabh4 do 1,4 addition and convert conjugated nitro group to only nitro group. in the picture right hand side type product u will get

NaBH4 do not reduce nitro group only LiAlH4 can. still here dithiane can be reduced in Acidic medium. check the list of groups reduced by NaBH4/MeOH