Final answer:
To modify the permissions for the HelpDesk security group in the Active Directory domain, you would use Active Directory Users and Computers. This graphical tool allows you to delegate control and modify permissions for organizational units, user accounts, and groups.
Step-by-step explanation:
To modify the delegated permissions for the HelpDesk security group in the Trainees organizational unit (OU) of the Active Directory domain, you would use Active Directory Users and Computers (ADUC). This tool provides a graphical interface for managing objects in an Active Directory domain, including OUs, users, and groups. It allows administrators to delegate control, specify permissions, and apply policy changes.
To delegate permission to the HelpDesk group for creating Group objects and modifying group membership, first, open ADUC, right-click the Trainees OU, and select 'Delegate Control.' Follow the delegation wizard to add the required permissions to the HelpDesk security group.