The marketing team at your company is having issues with an audio campaign they recently created for a new product launch. They asked you to help figure out what could be causing the problem. Within Display & Video 360, what could be the issue?

The correct answer is "One of the source files is in WAV format." Display & Video 360 (DV360) does not support WAV files for audio creatives. WAV files are uncompressed and typically too large for efficient ad serving. DV360 requires compressed audio formats like MP3 for audio ads. If a WAV file is used, the ad will fail to serve, causing issues with the campaign. "One of the ads is missing a companion creative" is incorrect because companion creatives are optional for audio ads; their absence wouldn't prevent the audio ad from serving. "One of the ads was created in Ad Canvas" is incorrect because Ad Canvas is a creative development tool within DV360, and ads created there are generally compatible. "One of the source files is in MP3 format" is incorrect because MP3 is a supported and commonly used format for audio creatives in DV360.