$($a$)$ Consider the discrete$-$time signal x$($n$),$ which is absolutely summable and has the following z$-$transform: X$($z$)=256+1088$z $1128$z $2+96$z $332$z $4+4$z $516+32$z$1104$z$2+88$z$331$z$4+4$z$5.$ Find the poles and zeros. Hence, determine the ROC. $$ Find x$($n$)$ and specify the causal and no$-$causal parts of x$($n$).$ Hence plot it$.$ item Determine the energy of the signal.

$$ Plot the magnitude and phase spectra of the signal.