NSA is the acronym for which defense agency?

• A. Network Security Agency
• B. National Surveillance Agency
• C. National Security Agency
• D. National Science Agency

Answer: (C)

NSA stands for National Security Agency. This U.S. defense and intelligence agency operates under the Department of Defense and is tasked with protecting government communications and information systems, as well as collecting and analyzing foreign signals intelligence. The other names don’t correspond to the actual agency’s title or duties—Network Security Agency would imply a general network-security role, National Surveillance Agency isn’t a real U.S. agency, and National Science Agency would focus on science rather than national security or signals intelligence.