Which of the following is the correct sequence of operations in a microprocessor?

• A. Opcode fetch, memory read, memory write, I/O read, I/O write
• B. Opcode fetch, memory write, memory read, I/O read, I/O write
• C. I/O read, opcode fetch, memory read, memory write, I/O write
• D. I/O read, opcode fetch, memory write, memory read, I/O write