What areas are considered functional in ISO-defined network management?

The correct choice identifies that accounting management and security management are considered functional areas in ISO-defined network management.

Accounting management is crucial in network management as it involves tracking the usage of network resources and ensuring that the accounting of these resources is done accurately. It allows organizations to understand resource consumption, chargeback to departments, and plan for future capacity based on usage trends.

Security management is equally critical as it involves implementing and maintaining measures to protect the network and its data from cyber threats. This includes monitoring for unauthorized access, ensuring compliance with policies, and managing vulnerabilities.

These areas address key aspects of maintaining the integrity, availability, and confidentiality of network systems, which are foundational principles within network management.