a$)$ Assume a $32-$bit machine. What is the content of each register and which memory locations are changed as the code below is executed. Use the register

and memory values in the table below as initial values.

sw R$4,8($R$2)$; $,M[8+R2]=R4$;

addi R$2,$ R$2,4$; $,$ R$2=$ R$2+4$;

Iw R$1,$ O$($R$2)$; $,R1=M[0+R2]$;

add R$3,$R$1,$R$2$; $,R3=R1+R2$;

Iw R$2,4($R$3)$; $,$ R$2=$ M$[4+$ R$3]$;

addi R$2,$R$2,8$; $,R2=R2+8$;

sw R$3,22($R$2)$; $,M[22+R2]=R3$;

addi R$4,$ R$2,4$; $,$ R$4=$ R$2+4$;