Discovery in OSINT involves:

• A. Open-source data: photos, documents, audio, video, satellite images, oral debriefing
• B. Secondary raw data filtered by analysis; can be agglomerated with editing
• C. Analysis, filtering, and dissemination to a specific category for particular information needs
• D. Validated OSINT with high degree of certainty

Answer: (A)

Discovery in OSINT is the phase of locating open-source information across a range of formats. It involves gathering raw, publicly available data such as photos, documents, audio, video, satellite images, and even oral debriefings. This raw material forms the basis for later processing, analysis, and validation. The other statements describe processing steps that come after discovery, like filtering and editing, performing analysis and dissemination, or confirming certainty after verification. Therefore, the best description of discovery is finding these diverse open-source materials.