You can use mobile advertising IDs as a file type to create hashed audiences

The correct answer is true because mobile advertising IDs (MAIDs), such as Apple's IDFA (Identifier for Advertising) and Google's GAID (Google Advertising ID), can be used as a file type to create hashed audiences. When advertisers upload these IDs into their platform, they can hash them to protect user privacy while still enabling effective targeting. By hashing mobile advertising IDs, advertisers can match users across devices for audience segmentation and retargeting without exposing personal or identifiable information. This method allows for privacy-compliant, targeted advertising based on user behavior or preferences while leveraging mobile advertising IDs as part of audience creation.