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Assertion: raising the clock frequency saves energy for a fixed computation. Reason: the work is finished sooner and the device sleeps for longer.

  • A.the assertion is true but the reason given for it is false
  • B.the assertion is false although the reason offered is a true statement in itself
  • C.both the assertion and the reason are true but the reason does not explain the assertion
  • D.both the assertion and the reason are true and the reason explains the assertion

Answer: C

The reason is correct as far as it goes and the assertion holds only where sleeping is nearly free, which is the race-to-idle case. On a part where leakage dominates, running slowly at a reduced voltage wins instead, so neither statement settles the matter alone.

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