Which program requires physical installation at an internet service provider to monitor emails and other electronic communications?

• A. Carnivore
• B. Mystic
• C. Bullrun
• D. Agency

Answer: (A)

Surveillance programs can be deployed by placing equipment inside a service provider’s network to intercept traffic. Carnivore was the FBI’s system installed at an internet service provider’s facility, specifically designed to monitor emails and other electronic communications as they traversed the provider’s network. Its key feature is the need for physical hardware installation at the ISP’s site to access and filter communications, which directly matches the scenario described. The other programs come from different agencies and focus on other methods—broader data collection across networks or cryptanalytic efforts—without the same ISP-based hardware tap for monitoring emails, so they aren’t the best fit for this description.