The advantage of _______ is that it can reference memory without paying the…

Answer: Register Indirect addressing

Why this is correct:

• How it works: The instruction specifies a register that contains the effective memory address. The CPU uses the value in that register to access memory rather than encoding the full address in the instruction.

• Main advantage: The instruction does not need to carry a full memory address, so instructions can be shorter and more flexible while still referencing memory.

• Compared to direct addressing: Direct addressing encodes the full memory address inside the instruction, increasing instruction size. Register indirect avoids that by referring to a register.

• Compared to indexed addressing: Indexed addressing uses a register plus a displacement (offset). It is useful for arrays but typically requires a displacement field in the instruction; register indirect only names a register holding the full address.

• Compared to register addressing: Register addressing accesses data already in a register (no memory reference). That does not meet the question's intent of referencing memory without encoding a full memory address.

• Trade-off: Register indirect requires a memory access to fetch the operand from the address stored in the register, so it is not as fast as pure register-to-register operations.

Example: LOAD R1, (R2) — load into R1 the value from the memory address contained in R2.