Answer:
Accounting.
Step-by-step explanation:
Computer networks are designed to allow computer devices to communicate intelligently. The connection of these network devices could be wired or wireless. A network can be private or public. Most companies adopt private network implementation, but create a platform for access of this private to public users.
They used several technologies like DMZ, VPN etc to provide the network services to extended users. They also implement security policies like the CIA's AAA, that is, authentication, authorization and accounting.
Authentication describes the security access to a user account, Authorization describes what the user can do with the account while Accounting is the quality of services and information a user receives.