Which of the following does not allow multiple users or devices to share one communications line?

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Which of the following does not allow multiple users or devices to share one communications line? Answer: doubleplexer

Question context

This question is part of 💻 Computing within the broader 💾 Computer Science subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.