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Multiple ChoiceHard 30s

Negative caching

Choose the best answer for: caching empty results
Options
  1. 1Never store negative results; every miss must hit the source again
  2. 2Cache every result including errors so nothing is ever recomputed
  3. 3Cache 'not found' to avoid repeated expensive lookups
  4. 4Cache empty results only transiently and evict them within seconds

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