_____ is the safeguarding of daily information (classified or unclassified) that others could use against the US.

• A. Operations Security (OPSEC)
• B. Information Security (INFOsec)
• C. Emissions Security (Emsec)
• D. Cyberspace Operations

Answer: (A)

OPSEC focuses on preventing adversaries from turning everyday actions and routine details into useful information that could undermine operations. The statement describes safeguarding daily information, even when it isn’t classified, because such information can reveal patterns, vulnerabilities, or intentions that an enemy could exploit. OPSEC treats these everyday indicators as potential openings and aims to identify what information is sensitive, assess how it could be misused, and apply countermeasures to reduce or hide those indicators. In other words, it’s about making daily activities or signals harder for opponents to interpret in a way that would harm the US. Information Security deals with protecting data from unauthorized access in general, not specifically with the observable indicators of daily operations. Emissions Security is about preventing eavesdropping through radiated signals, and Cyberspace Operations covers broader cyber activities. Therefore, OPSEC is the best fit for this description.