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The Information Technology Security Evaluation Criteria (ITSEC) primarily focuses on two main aspects: functionality and assurance. Functionality refers to the security mechanisms that are implemented in a system and how they operate to protect data and resources. This includes assessing whether the system can meet specific security requirements, such as access control and authentication.

Assurance, on the other hand, pertains to the level of confidence that the security mechanisms are functioning correctly and can be trusted to provide the intended protection. Assurance levels help evaluate how well the design, implementation, and operation of security features have been validated through testing and analysis.

This differentiation is crucial because having functionality alone does not guarantee that a system is secure; it is equally important to ensure that the functionality is reliable, consistent, and can withstand potential threats. Thus, ITSEC provides a structured way of evaluating these aspects to enhance the overall security posture of IT systems. The other provided options do not align with ITSEC's primary focus.