Select the domain name.

The correct choice identifies a domain name, which is a human-readable address used to access websites. A domain name typically consists of a second-level domain followed by a top-level domain, separated by a dot.

In this case, "mheducation.com" qualifies as a complete domain name because it includes both the second-level domain "mheducation" and the top-level domain ".com." This structure allows users to easily navigate to the website by typing the domain name into a web browser.

In contrast, the other options do not meet the criteria of a standard domain name. The entry "books.mheducation.com" represents a subdomain of "mheducation.com," which, while valid in its own right, is not a primary domain name. The format "192.0.2.1" is an IP address, used to identify a specific device on a network but not a domain name. Lastly, "www.mheducation" lacks the top-level domain component that is necessary for it to be a complete domain name.

Thus, "mheducation.com" is the best representation of a full domain name among the provided choices.