Here's why:
* Verb: The core meaning of "interviewed" is related to the action of conducting an interview.
* Past Participle: "Interviewed" describes an action that has already happened. It can be used in various grammatical contexts, such as:
* Passive voice: "The candidate was interviewed yesterday."
* Perfect tenses: "They have interviewed all the applicants."
* Participle phrases: "Having been interviewed, the candidate felt confident."