Final answer:
Access control is a security mechanism that allows only specific users to use a service or access a system. It does not deny access to users named in the files nor guarantee that no one will ever be able to use a specific part of the system. It can be used to open up a server to intranet users. so, option C is the correct answer.
Step-by-step explanation:
The subject of this question is Access Control in the field of Computers and Technology. Access control is a security mechanism that allows only specific users to use a service or access a system.
Option A in the question is incorrect. Access control does not deny access to users named in the files, but rather allows only specific users to access the system.
Option B is also incorrect. Access control does not guarantee that no one will ever be able to use a specific part of the system. It simply controls who can access it.
Option C is correct. Access control can be used to open up a server to intranet users. Intranet users are those who are part of the organization's internal network.
Option D is incorrect. Access control does not block access to internet users. It only controls access to the system or service based on predefined rules and restrictions.