Which of the following is an example of a top-level domain?

The correct answer is indeed an example of a top-level domain (TLD), which is the last segment of a domain name that follows the final dot. In this case, ".com" is classified as a generic top-level domain (gTLD), primarily associated with commercial entities but used for various purposes today.

Top-level domains serve an important function in the Domain Name System (DNS) as they help identify and categorize internet resources.

The other choices provided represent complete domain names rather than TLDs. "umich.edu" includes the educational institution's second-level domain "umich" and the TLD ".edu," which is specifically reserved for accredited postsecondary institutions. "wikipedia.org" consists of the second-level domain "wikipedia" along with the TLD ".org," designated for non-profit organizations. Both are examples of fully qualified domain names that utilize a top-level domain as part of their structure, but they are not top-level domains by themselves.