Consider the instruction ADD DOG,AX

in which the contents of the AX register and memory cell DOG are added together and the results are stored in DOG. Choose the correct sequence of circuits which will correctly implement this instruction. TMP below is a temporary register.

Question $4$ options:

$1.)$

IP$->$MAR

MEM$($MAR$)->$ MDR

MDR$->$IR

AX $->$ TMP

TMP$+$BX$->$ TMP

TMP $->$ AX

IP $+2->$ IP

$2.)$

IP$->$MAR

MEM$($MAR$)->$ MDR

MDR$->$IR

ADDR$($IR$)->$MAR

MEM$($MAR$)->$MDR

MDR$+$AX$->$MDR

IP $+2->$ IP

$3.)$

IP$->$MAR

MEM$($MAR$)->$ MDR

MDR$->$IR

ADDR$($IR$)->$MAR

MEM$($MAR$)->$MDR

MDR$+$AX$->$AX

IP $+2->$ IP

$4.)$

IP$->$MAR

MEM$($MAR$)->$ MDR

MDR$->$IR

ADDR$($IR$)->$MAR

MEM$($MAR$)->$MDR

MDR$+$AX$->$MDR

MDR$->$MEM$($MAR$)$

IP $+2->$ IP