You are given a system which follows the ATT x$86$ instruction format $($OPCODE src$1,$ src$2,$ dest$).$

This system only has four registers in the processor R$1,$ R$2,$ R$3,$ R$4$ and can access memory

locations from $0$X$0000$ to $0$XFFFF$.$ Addressing modes allowed for this system are IMMEDIATE,

DIRECT, or REGISTER$-$DIRECT. State which addressing mode is used for each of the following

instructions. $[(1+1+1+1)$ pts$]$

i$.$ LOAD $0$XA$12$D$,$ R$2$

ii$.$ SUB R$1,$ R$2,$ R$3$

iii. ADD R$2,0$XA$12$B$,$ R$3$

iv$.$ STORE R$2,0$XA$12$A