A.
s=tf('s');T=0.1;G=2/(s+2);z=tf('z',T);Gc=8*(z-1)/(z-0.8);G=feedback(G*c2d(Gc),1)
B.
s=tf('s');T=0.1;G=2/(s+2);z=tf('z',T);Gc=8*(z-1)/(z-0.8);G=feedback(d2c(G,T)*Gc,1)
C.
s=tf('s');T=0.1;G=2/(s+2);z=tf('z',T);Gc=8*(z-1)/(z-0.8);G=feedback(c2d(G,T)*Gc,1)
D.
s=tf('s');T=0.1;G=2/(s+2);z=tf('z',T);Gc=8*(z-1)/(z-0.8);G=feedback(G*d2c(Gc),1)