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(Polling versus interrupts) Which of the statements below is correct ?

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(Polling versus interrupts) Which of the statements below is correct ?

  1. Polling is done periodically by the CPU
  2. Polling requires less hardware in peripherals than interrupts
  3. Polling makes more demands on CPU resources than interrupts
  4. Polling is harder to implement than interrupts
    1. i only
    2. ii and iv
    3. i and iii
    4. i, ii. iii and iv
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