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Multiple ChoiceBeginner 45s

Content-addressed dedup in file storage

A file-sharing service wants to store duplicate uploads only once. Which keying enables dedup?
Options
  1. 1Addressing blobs by upload timestamp
  2. 2Addressing blobs by the hash of their content
  3. 3Addressing blobs by the uploading user ID
  4. 4Storing a full copy per user always

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