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A driver buffers incoming data chiefly because

  • A.the processor cannot read the register fast enough
  • B.the application requires all of the data in one single block
  • C.the producer and the consumer run at different times
  • D.the device cannot supply data at a steady rate

Answer: C

Data arrives when the device chooses and is read when the application gets round to it, so something must hold it in between. How much is needed follows from the arrival rate and the longest the consumer may be delayed.

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