A data engineer (User A) deployed a pipeline to production by programmatically creating multiple jobs via the REST API. A DevOps engineer (User B) set up an external orchestration tool to initiate job runs through the REST API, with both users authenticating using their personal access tokens.

Later, a workspace admin (User C) assumes responsibility for managing this pipeline and uses the Databricks Jobs UI to take ownership of each job. The jobs continue to be executed using User B's credentials and orchestration tool.

An application collects and processes run information returned by the REST API. What value appears in the creator_user_name field?