Which of the following are two types of domain names?

The correct answer, which identifies relative names and fully qualified domain names (FQDN), highlights an essential distinction in the realm of domain naming. A fully qualified domain name provides the complete address of a specific resource on the internet, comprising both the hostname and the domain itself (like www.example.com). This type of domain name specifies its exact location in the hierarchy of the Domain Name System (DNS), allowing it to be uniquely identified and accessed.

In contrast, a relative domain name does not provide the complete path and instead relies on a context where the full domain name can be inferred — for example, 'www' might refer to 'www.example.com' but would need a defined base domain to be fully understood. Understanding this distinction is fundamental for navigating the internet's structure, especially in networking and web management contexts.

The other choices describe valid concepts in domain management but do not match the classification of types of domain names. Dynamic and static domain names refer more to how DNS records are updated but do not classify the names themselves. Public and private domain names focus on the accessibility of the domains, while primary and secondary domain names pertain to DNS setups involving master and slave servers, rather than typologies of names.