Answer to Problem 2.8
  1. ISBN is generally good if you are dealing with books published relatively recently
  2. VIN is generally good if you are dealing with recently manufactured cars
  3. Student ID is good. Uniqname is probably also okay, but there are privacy issues with this.
  4. Probably some generated id number. Address wouldn't be good because addresses can change.
  5. Name of the color.

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