Which of the following describes an EEFI focused on communication security?

COMSEC, or Communications Security, is the correct answer because it specifically relates to safeguarding communications from interception and exploitation by unauthorized entities. COMSEC encompasses various measures, including encryption, transmission security, and the protection of communications equipment, all aimed at ensuring the confidentiality and integrity of transmitted information. This concept is crucial for maintaining operational security and effectiveness in military and strategic communications.

The other options are broader or refer to different aspects of military operations. Electronic Warfare (EW) focuses on disrupting or manipulating enemy electronic systems and is not limited to communication security. The term "Operations" refers generally to military actions and planning without a specific focus on communication security. "WRONG CIRCUIT" likely indicates a miscommunication or improper channel use rather than a dedicated security measure. Therefore, selecting COMSEC highlights a clear commitment to communication security within the context of military operations.