Answer:
RADIUS.
Step-by-step explanation:
RADIUS:- It's full form is Remote Authentication Dial-In User Service.It is a software and a protocol for client/server that lets the servers having remote access to communicate with the central server so that it can validate dial-in users and it can authorize their accessibility to the system or service they requested .
It provides better security.It lets an organisation or a company to maintain profiles of the users in a central database so that it can be shared by the remote servers.