What type of account is required to join a computer to a domain?

To join a computer to a domain, a valid account must have sufficient permissions to perform that action. Typically, this requires either an account that is a member of the Domain Admins group or an account that has been delegated the necessary permissions to join a computer to the domain.

A local standard account would not have the privileges needed for domain actions because it operates within the confines of the local machine and does not interact with the domain's security structure. Configuring a device to connect to a domain involves alterations to the domain's directory service, which is a task reserved for accounts with higher privileges, such as those of domain administrators.

In contrast, the other options, such as an administrator or domain user, while capable of managing various aspects of computers, do not match the specific requirements for the straightforward task of enrollment in the domain without additional delegation and permissions configured in the domain's environment. A Guest account is even more restricted and is typically only used for limited, temporary access.