Roller Derby Test O'Matic

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Question #905:

Which of the following is a valid unique identification for a referee?

  1. Name and number (the number has no restrictions)
  2. Referees do not need to wear any identification on their back
  3. Only a number, which may contain letters and symbols
  4. Only a number, which must be between 1 and 4 numerical digits (no letters or symbols)

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