Final answer:
A website URL is not considered a former or popular name of an organization; it's a web address for online identification, not a name used for official or common recognition.
Step-by-step explanation:
When identifying which option is not an example of an organization's former or popular name, we should understand what typically constitutes a widely recognized name for an organization. An acronym used in official documents is often derived from a longer, more cumbersome name to facilitate easier reference. A previous name used before a legal change definitely constitutes a former name that an organization might have been known by. A nickname commonly known in the community could also be considered a popular name for an organization, especially if it's used routinely in informal contexts.
However, a website URL is not an example of a former or popular name. While it can be associated with the organization, it's a web address used to locate the organization online rather than a name or title by which the organization is known. Therefore, the correct answer is D) A website URL.