How should an administrator test the functionality of DNS operation on a domain controller, as well as troubleshoot issues with DNS forwarders, delegation, dynamic updates, and record registration?

Using dcdiag / test:dns

Explanation:

Using dcdiag / test: dns, the admin can check certain performance of the following controller's DNS service and also troubleshooting concerns including DNS forwarders, relocation, dynamic notifications and authentication. So, the following answer is correct according to the given statement.