Which of the following is a requirement established by E.O. 12333?

The correct choice revolves around the requirement for cooperation among intelligence agencies for national policy as established by Executive Order 12333. This executive order, signed in 1981, outlines the responsibilities of U.S. intelligence agencies and emphasizes the need for coordination and collaboration among them to effectively support the national security of the United States.

The focus on cooperation is critical because intelligence gathering and analysis often require information sharing between agencies to provide a comprehensive understanding of threats and to formulate responses. By fostering inter-agency collaboration, Executive Order 12333 aims to enhance the effectiveness of the national intelligence community, ensuring that all agencies work in concert rather than in silos.

While the other options may be relevant to broader security and intelligence activities, they do not specifically reflect the core mandate established within Executive Order 12333. Monitoring domestic security threats pertains more to law enforcement and domestic security interests rather than the intelligence community's cooperative framework. Development of insider threat protocols and conducting public awareness campaigns are important aspects of security policy, but they fall outside the specific intentions laid out in E.O. 12333.