Comprehensive and Detailed In-Depth

When NIOS uses remote authentication (e.g., RADIUS, LDAP, or Active Directory), user authentication is handled by the external server, but permissions are defined within the NIOS Grid. For a group like 'Infoblox-Admins,' the external server verifies user credentials and group membership, but the Grid Manager assigns permissions (e.g., read/write access to DNS zones) to the group itself. This centralizes access control within NIOS, ensuring consistency across the Grid. Options A and B are incorrect because the external server manages authentication, not NIOS-specific permissions. Option D is wrong as permissions are group-based, not individually assigned on the Grid. The INE course covers Grid administration, including authentication setup.