A television reporter may provide supporting details for a story by
providing fictional details about the story for audiences to enjoy.
interviewing people who are directly connected with the story itself.
describing events that are unrelated but also interesting in the report.
researching further information about the story he or she is covering.
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I'd probably go with the second choice...interviewing people who are directly connected with the story itself. An earlier question you asked touched on the same topic -- that interviews can add to a story -- so this makes sense.
Writing fiction about a story would only damage the credibility of the reporter and describing unrelated events can also hurt the accuracy of the story itself. Researching further isn't a bad idea, either, but it could also be the start of something much larger like a documentary or an investigative piece.
4 seems tbh not for a reporter on television ...i don't know though