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NIELIT 2016 MAR Scientist C - Section C: 47

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If a processor does not have any stack pointer register, then

  1. it cannot have subroutine call instruction
  2. it can have subroutine call instruction, but no nested subroutine calls
  3. nested subroutine calls are possible, but interrupts are not
  4. all sequences of subroutine calls and also interrupts are possible
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