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The correct answer focuses on the transition of a formal security policy model into an executable format that is conducive to implementation. When a mathematical expression of a security policy is created, it often takes the form of a programming language. This is because programming languages provide the necessary structure and syntax to implement the security model in software systems.

Mathematical expressions can define complex concepts like access controls or workflow rules that must be enforced within a system. By translating these into a programming language, it allows developers to codify the security principles within applications, automating enforcement and ensuring adherence to the defined policies.

The other options do not serve the purpose of directly implementing a mathematically expressed security model. A security guideline document typically outlines policies and procedures but does not convert mathematical concepts into functional code. A user manual focuses on instructing users on how to operate software rather than executing security policies. A network diagram represents the physical or logical layout of a network and does not encapsulate policy enforcement. Thus, the choice of a programming language becomes the most suitable option for this translation process.