Final answer:
The correct term for the definition provided, which explains OPSEC, is 'b. OPSEC (Operational Security).' It is a process designed to protect both digital and physical information in operational contexts.
Step-by-step explanation:
The term that matches the definition to help explain OPSEC (Operational Security) is b. OPSEC (Operational Security). OPSEC is a process that helps identify critical information to determine if friendly actions can be observed by adversary intelligence systems, determine if information obtained by adversaries could be interpreted to be useful to them, and then execute measures that eliminate or reduce adversary exploitation of friendly critical information. Unlike cybersecurity, which focuses on protecting information in the digital realm, OPSEC is concerned with the overall security of operations, including the protection of both digital and physical information from the view of potential adversaries.