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The USB transfer type used for a keyboard is

  • A.isochronous, which guarantees bandwidth without retries
  • B.control, which is used only for configuration
  • C.interrupt, which guarantees a polling interval
  • D.bulk, which offers the highest throughput

Answer: C

A small amount of data with a bounded latency is exactly what interrupt transfers provide, the host polling at the interval the device requests. Bulk suits mass storage, isochronous suits audio, and control carries the setup traffic.

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