Final answer:
In an Active Directory domain, Group Policy Object (GPO) is used to manage access and environment settings for individual desktop workstations. GPOs contain policy settings that apply to user and computer accounts within selected containers like domains or OUs.
Step-by-step explanation:
To manage individual desktop workstation access within the TESTOUTDEMO.com domain, a Group Policy Object (GPO) is commonly used. A GPO is a virtual collection of policy settings created with Microsoft Management Console (MMC) policy snap-ins. Once a GPO is associated with selected Active Directory containers such as sites, domains, or Organizational Units (OUs), the settings contained in the GPO are applied to all users or computers that are part of those Active Directory containers.
While a User Account is used to manage individual user access and permissions, and a Domain Controller is a server that responds to security authentication requests within the Windows Server domain, it is the Group Policy Object which controls the working environment of user and computer accounts by enforcing policy settings such as password policies or software installation guidelines.
An Organizational Unit, on the other hand, is simply a container within the Active Directory that can be used to organize objects into logical administrative groups. While OUs are often used to facilitate Group Policy application, on their own they do not manage desktop workstation access.