Comprehensive and Detailed In-Depth Explanation:Permissions in NIOS (Administration > Administrators):
* A (Admin Accounts):Individual accounts can have specific permissions (e.g., read-only DNS). Correct.
* B (Groups):Admin groups get collective permissions (e.g., "DNS_Admins" write access). Correct.
* C:"Roles" isn't a distinct NIOS entity-permissions tie to groups/accounts. Incorrect.
* D:Superusers have unrestricted access, not assigned permissions-they override limits. Incorrect.
* Practical Example:In an INE lab, assign DNS write to a group and read-only to an account, test access, and troubleshoot restrictions.References:Infoblox NIOS Administrator Guide - Permissions; INE Course Objective: NIOS DDI Grid Deployment.