Group Members API - Inference of different values of type attribute in User object in payload

In API
https://developer.atlassian.com/cloud/confluence/rest/api-group-group/#api-api-group-member-get

What does these 4 values imply in type field of User object?
When will be user’s type:

  1. user
  2. known
  3. unknown
  4. anonymous

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