Providing information to a client only upon client request is an example of:

The scenario describes "pull technology," which is characterized by the user actively seeking out information rather than it being automatically delivered to them. In this case, providing information to a client only when they specifically request it fits the definition of pull technology. The user initiates the action by asking for the information, thereby "pulling" it from the source.

In contrast, push technology involves the automatic delivery of content to users without their explicit request, such as newsletters or updates sent directly to an email inbox. Active browsing refers to the process of users navigating and interacting with web content directly, and web crawling involves automated processes where a search engine systematically browses the web to index content. Thus, "pull technology" is the correct concept here as it reflects the client-initiated action of requesting information.