{CodeRoyale}
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Multiple ChoiceHard 45s

Abstractness and the main sequence

Martin's main sequence plots abstractness vs instability. A module at the 'zone of pain' is best described as:
Options
  1. 1Highly abstract with abstractness near 1 and highly unstable.
  2. 2Abstract and stable, with abstractness near 1 and many dependents.
  3. 3Highly concrete (abstractness near 0) yet highly stable (many depend on it)
  4. 4Concrete and unstable with few dependents. That combination is harmless and safe.
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