Muti-field records

Which of the following is/are true?
  1. Fixed format files use delimiters
  2. Delimited files use commas
  3. Delimited files may have multiple fields per record
  4. Fixed format files may have multiple fields per record
  5. Delimited files must have multiple fields per record
  6. Fixed format files must have multiple fields per record

Explain your answers.

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