Delegated Administration is a powerful feature that allows a System Administrator to pass off specific administrative tasks to non-admin users without granting them the full "Modify All Data" permission. However, there are strict security boundaries to what a delegated admin can do. One of the most critical limitations is that delegated administrators cannot modify permission sets. They are primarily intended to manage users within specific roles, reset passwords, and manage specific custom objects. While they can assign users to certain profiles that have been explicitly allowed in the Delegated Administration group configuration, they are not permitted to manage the broader security architecture of the org, such as Permission Sets or Field-Level Security (Option B). This ensures that while junior staff can handle day-to-day user maintenance (like unlocking users, contrary to Option A), they cannot inadvertently elevate their own permissions or those of others through permission set manipulation.