In the instruction, 500 SUBA # 50 the command field is: A. 500 B. # 50000 C. SUBA D. (b) and (c) E. None of the above

The correct answer is: C. SUBA

The command field is the part of an instruction that specifies the operation to be performed. In the instruction, 500 SUBA # 50, the command field is SUBA.

The address field is the part of an instruction that specifies the address of the operand to be operated on. In the instruction, 500 SUBA # 50, the address field is # 50.

The data field is the part of an instruction that specifies the data to be operated on. In the instruction, 500 SUBA # 50, the data field is 500.

Here is a brief explanation of each option:

• Option A: 500. This is the data field. The data field is the part of an instruction that specifies the data to be operated on. In the instruction, 500 SUBA # 50, the data field is 500.
• Option B: # 50000. This is the address field. The address field is the part of an instruction that specifies the address of the operand to be operated on. In the instruction, 500 SUBA # 50, the address field is # 50.
• Option C: SUBA. This is the command field. The command field is the part of an instruction that specifies the operation to be performed. In the instruction, 500 SUBA # 50, the command field is SUBA.
• Option D: (b) and (c). This is not a valid option. The command field and the address field are two different fields in an instruction.
• Option E: None of the above. This is the correct answer. The command field is the part of an instruction that specifies the operation to be performed. In the instruction, 500 SUBA # 50, the command field is SUBA.