Final answer:
The primary function of AV Diags is to perform video quality diagnostics. It is used to troubleshoot and ensure the integrity of video broadcasts and recordings, rather than providing services such as video on-demand or fiber optic installation support.
Step-by-step explanation:
The primary function of AV Diags (Audio/Video Diagnostics) is to provide tools for video quality diagnostics. This term often refers to software or systems used within the media industry and related fields to troubleshoot and ensure the quality of video broadcasts or recordings. The correct answer to the question is c) Video quality diagnostics. AV Diags does not provide video on-demand services, audio signal testing specifically, nor does it support fiber optic installation. Instead, it focuses on diagnosing problems related to video quality, such as resolution issues, frame rate problems, and compression artifacts that can occur during the recording, editing, or playback processes.