For each H$($z$)$ given, determine all possible ROCs and classify each as causal,

stable, causal and stable, or neither. $($a$)$ H$($z$)=1+$z$1$

$(1$z$1)2(1+1$

$2$ z$1)2.$

$($b$)$ H$($z$)=1+$z$1$

$(1+2$

$5$ z$1)2(12$

$5$ z$1).($c$)$ H$($z$)=1+$z$1$

$(14$z$1+16$z$2)(1+3$

$4$ z$1).$