A network administrator is migrating a domain to a different provider.

The best answer is D. TXT. When a provider asks an administrator to prove ownership of a domain, the most common method is to have the administrator place a specific verification value inside a DNS TXT record. The provider then checks public DNS for that value. If the expected text is present, it confirms that the person managing the migration has control over the domain’s DNS settings.

This matches how TXT records are commonly used in real network environments. They are flexible and can store readable text strings for verification, policy, and security-related purposes. In Network+ study material, TXT records are frequently associated with things like domain validation and email-related configurations such as SPF and other verification mechanisms.

The other record types do not fit this task. An A record maps a hostname to an IPv4 address. A CNAME points one name to another name. A PTR record is used for reverse DNS, mapping an IP address back to a hostname. None of those are typically created just to prove domain ownership during provider onboarding.

The key clue is the phrase “domain ownership proof”, which strongly points to a TXT record.