Question

what is the type of register that is use by the control unit to fetch opcodes? data register accumulator base register instruction register

Explanation:

The Instruction Register (IR) holds the current instruction (including the opcode) that the Control Unit fetches from memory, allowing the unit to decode and execute the instruction. Data registers handle data values, accumulators store arithmetic results, and base registers assist with memory addressing, none of which are used to fetch opcodes for the Control Unit.

Answer:

D. Instruction Register