Final answer:
By default, the Administrator group has full access to all resources within a domain, with this group having full control permissions to manage and configure the domain effectively.
Step-by-step explanation:
By default, the Administrator group has full access to all resources within a domain. This is because the Administrator account and associated group are granted full control permissions and are responsible for the management and configuration of the domain. Other groups such as Guests, Power Users, and Users have more limited permissions that are typically defined by the system administrator based on the principle of least privilege, which means giving users only the access that is required to perform their jobs.