The correct implementation includes Fa1 and Fa3 only according to the visible answer area. In Azure Functions security scenarios, apps are included only when their hosting, authentication, identity, or network configuration matches the stated technical controls. Including Fa2 would apply the implementation to an app that does not meet those requirements. The selected set therefore narrows the change to the function apps that require the security implementation. For SC-500, compute controls are evaluated by workload type: VM, Arc server, AKS, container registry, container group, Functions, Logic Apps, App Service, and AI agent runtime. The right answer uses the Microsoft control that is native to that workload. Broad Azure roles or unrelated monitoring services would either overgrant access or fail to enforce the required security state. The result is a direct exam-style implementation choice: it changes the required security behavior without relying on unrelated monitoring, manual cleanup, or excessive privilege. Official Microsoft source/topic: SC-500 Study Guide > Azure Functions security controls; Microsoft Learn > App Service/Functions authentication and network security.

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