What is a primary reason for using organizational units (OUs)?

Using organizational units (OUs) primarily allows for the efficient application of Group Policy settings. Group Policies are critical in managing the configuration of user and computer settings across an organization's network. When OUs are set up, IT administrators can delegate control over specific groups of users and computers, tailoring policy deployment to meet the unique needs of different departments or units.

For example, an organization might create separate OUs for different departments, enabling administrators to apply distinct policies that correspond to each department's requirements. This hierarchical structure ensures that policies can cascade down through the levels of the organization while also allowing for flexibility in individual OUs, which can be adjusted as needed without impacting the entire domain.

The option about creating security boundaries, while relevant to OUs, does not capture the primary use, as security boundaries often relate more to domains or sites. Similarly, while consolidating administrative tasks and simplifying domain structures are benefits of using OUs, they are not the primary reason compared to the direct impact of applying Group Policies effectively.