Which domains are included as common top-level domains?

The correct choice provides examples of common top-level domains (TLDs) used in the domain name system of the internet. Top-level domains are the last segment of a domain name, following the final dot, and they indicate the purpose or characteristics of the domain.

The examples given—.com, .org, and .net—are some of the most widely recognized and used TLDs.

• .com is primarily used for commercial entities but has become a default choice for many types of websites.

• .org is typically used by non-profit organizations but is also adopted by various other types of entities as well.

• .net was originally intended for organizations involved in networking technologies, such as internet service providers, but like .com and .org, it has a much broader usage today.

Understanding TLDs is crucial for recognizing the nature of a website and its purpose, as they play a significant role in internet navigation and domain name identification.

The other choices do not represent common top-level domains. For instance, terms like "mail," "www," and "ftp" refer to various services or prefixes associated with the internet rather than TLDs. Similarly, "subdomain," "host,"