The correct answer is A. Search engine.
A search engine is a software system that is designed to search for information on the World Wide Web. Search engines work by crawling the web, indexing websites, and then providing users with a list of results that match their search query.
A web browser is a software application that allows users to access and view web pages. Web browsers are used to navigate the World Wide Web, and they are the most common way for people to access information on the internet.
A website is a collection of web pages that are usually related to a particular topic or purpose. Websites are typically hosted on a web server, which is a computer that is connected to the internet and that stores the website’s files.
A web server is a computer that is connected to the internet and that stores the files for a website. When a user visits a website, their web browser sends a request to the web server, and the web server sends the requested files back to the user’s web browser.