Final answer:
The individual or (system) process authorized to access an information system is the User. The Administrator is responsible for managing the system, and the Firewall acts as a security measure.
Step-by-step explanation:
The individual or (system) process authorized to access an information system is the User. Users are typically assigned usernames and passwords to authenticate themselves and gain access to the system. They have limited access and are not authorized to make changes to the system or its settings.
The Administrator, on the other hand, has higher privileges and is responsible for managing the information system. Administrators have access to all areas of the system and can configure settings, create user accounts, and grant permissions.
The Firewall is a security measure that filters network traffic and prevents unauthorized access to the information system. It acts as a barrier between the system and external networks, monitoring incoming and outgoing traffic for potential threats and blocking them.