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The computers that have a single processor register usually assign to it the name:

  • A.stack
  • B.pointer
  • C.accumulator
  • D.opcode

Answer: C

In a computer with a single processor register, that register holds the operand and the result of the arithmetic and logic operations, and it is usually called the accumulator (AC). A stack and a pointer are memory structures and registers for addresses, and an opcode is the operation part of an instruction, so none of them is the single working register. The answer is accumulator, option C.

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