Which option BEST explains the rationale for collecting intelligence at conferences when that intelligence cannot be obtained through Internet sources?

• A. Rogue signals and on-site interception of cellular traffic.
• B. Monitoring conference attendees' social media posts for activity.
• C. Geospatial reconnaissance and image-based intelligence collection from on-site vantage points.
• D. Imagery intelligence collection on-site during the conference.

Answer: (D)