Answer
General-purpose registers are used to hold the data immediately applicable to the operation at hand; main memory is used to hold data that will be needed in the near future, and mass storage is used to hold data that will likely not be needed in the near future.
Work Step by Step
General-purpose registers are used to hold the data immediately applicable to the operation at hand; main memory is used to hold data that will be needed in the near future, and mass storage is used to hold data that will likely not be needed in the near future.