A search engine is an information system that enables users to retrieve data from the web by using keywords to search for their topic of interest. So, the correct choice for this question is (c). i.e. Search Engine.
Search engine helps the user to search for their keywords and retrieve related data from the websites that are indexed by a search engine. It enables user to retrieve data from a website. When users enter any keywords related to their topics, the search engine searches those keywords from the repository that has been indexed against that keywords. There are many search engines in the world such as Goo-gle, Ya-hoo and Bin-g. They help user to search the required information over the internet.
However, the other options are not correct because:
A data warehouse is a repository or collection of different databases that aims to perform business intelligence functions, while a data mart is the simplest form of a data warehouse that focuses on a single subject of business. Whereas a web server contains a collection of websites to serve the users against the information they want to search on that websites.
You can learn more about search engines at
https://brainly.com/question/512733
#SPJ4
