Moderate

What have become de rigueur for computer-based products and systems of every type ?

Correct answer: A. GUIs

  • A. GUIs
  • B. Candidate keys
  • C. Object model
  • D. All of the mentioned

Explanation

Graphical user interfaces have become standard for most modern computer-based products because they provide familiar visual interaction. Candidate keys and object models are internal design concepts, not universal product features.

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