Which of the following is a prerequisite for adding an internal domain?

Adding an internal domain in various systems usually requires certain preconditions to ensure that the domain is correctly configured and recognized by the associated infrastructure. One major requirement is that the domain name must indeed be registered. This registration confirms that the domain is valid and allows the necessary DNS records to be created and managed.

In addition to the registration requirement, the ability to modify DNS Zone Files is also essential. This modification is necessary for establishing the correct routing and functionality associated with the domain within the internal network or the system being configured. Without the capability to edit these zone files, you would not be able to set up or maintain the DNS records needed for the proper operation of the internal domain.

Thus, both conditions are vital to successfully add an internal domain. Given this context, choosing the option that recognizes both as prerequisites highlights the importance of domain registration and DNS management in the process.