Final answer:
The Administrators group is assigned the Allow log on locally right on workstations and member servers by default. Server Operators, Account Operators, and Print Operators do not have this default assignment.
Step-by-step explanation:
The group that is assigned the Allow log on locally right assigned to by default for workstations and member servers is Administrators. This group consists of the highest level of access and control over a computer or network. Members of the Administrators group have the ability to perform tasks such as installing software, managing user accounts, and modifying system settings.
Server Operators, Account Operators, and Print Operators are also important groups, but they do not have the default assignment for the Allow log on locally right on workstations and member servers. Server Operators have privileges that enable them to manage servers, Account Operators have privileges to manage user accounts, and Print Operators have privileges to manage print servers and print jobs.
Overall, the Administrators group has the highest level of access and control, making it the default group assigned to the Allow log on locally right on workstations and member servers.