$(10)$ The following figure shows the block diagram of an n$-$bit ALU constructed using $n$ one$-$bit circuits. Using muxes, full$-$adders and other gates as necessary, show the circuitry that goes inside each one$-$bit circuit. The function of the resulting ALU is to be as described in the truth$-$table given. Note that the $O=$A function just implies that what is on the A inputs appears at the $O$ outputs unmodified.

$\backslash$table$[[$S$\_(1),$S$\_(0),$Sub,Function$],[0,0,0,$O$=$A$+$B$],[0,0,1,$O$=$A$-$B$],[0,1,$x$,$O$=$A$],[1,0,$x$,$O$=$Not$($A$)],[1,1,$x$,$O$=$AANDB$]]$