What is a virtue by which you need to secure information by limiting computer access to authorized personnel only

If you're asking for a method for limiting access to certain people, Domains are the way to go. Windows Active Directory is a good way to give a group of users permissions to access certain files. Linux has it's own solution called Samba, which follows inline with the application level SMB (Server Message Block) protocol.

Solution: the categorization of functional and non-functional requirement are as follows: some of the more typical functional requirements include: • business rules• transaction corrections, adjustments and cancellations• administrative functions• authentication• authorization levels• audit tracking• external interfaces• certification requirements• reporting requirements• historical data• legal or regulatory requirementswhile,some typical non-functional requirements are: • performance – for example response time, throughput, utilization, static volumetric• scalability• capacity• availability• reliability• recoverability• maintainability• serviceability• security• regulatory• manageability• environmental• data integrity• usability• interoperability