High School

Respond with the assembly instruction according to the comment: "Decrement the counter by 1."

Option 1:
```assembly
DEC COUNTER
```

Option 2:
```assembly
SUB COUNTER, #1
```

Option 3:
```assembly
LDX COUNTER
DEX
STX COUNTER
```

Option 4:
```assembly
LDAA COUNTER
DEC COUNTER
```

Answer :

Final answer:

The best assembly language instruction to decrement a counter by 1 is likely 'DEC COUNTER' or 'SUB COUNTER, #1', though the exact instruction can vary based on the assembly language and processor being used.

Explanation:

To decrement the counter by 1 in assembly language, the correct instruction would depend on the specific assembly language you are using. However, considering general assembly principles, Option 1 DEC COUNTER directly decrements the value of COUNTER. Option 2 SUB COUNTER, #1 subtracts 1 from COUNTER. Both of these instructions are succinct and perform the required action.

Option 3, involving loading the counter into a register (LDX), decrementing the register (DEX), and then storing back (STX) is a more verbose sequence of instructions that would also accomplish the task.

Option 4 LDAA COUNTER followed by DEC COUNTER would first load the accumulator with the value of COUNTER, and then the DEC instruction would not be valid since it is not followed by the accumulator. The correct sequence for option 4 should be LDAA COUNTER,DECA, STAA COUNTER assuming DECA decrements the accumulator.

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