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The Storage-to-Storage instructions

  • A.have both their operands in the main store.
  • B.which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also written into the specified storage location.
  • C.which perform indicated operations on two fast registers of the machine and have the result in one of the registers
  • D.all of the above

Answer: A

Correct answer: have both their operands in the main store.

Storage-to-storage instructions take both operands from main memory and return the result there, without loading either into a register first - the form used for moving and comparing character strings. Register-to-storage and register-to-register instructions are the other two families.

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