Which protocol (scheme) is used in URL?

The correct answer is Option B (HTTP). A URL, or Uniform Resource Locator, requires a protocol scheme to specify how the data should be retrieved from the web server. HTTP (Hypertext Transfer Protocol) is the standard protocol used for transmitting hypermedia documents, such as HTML pages, over the World Wide Web. When a URL begins with 'http://' or 'https://', it indicates that the browser should use this protocol to request and receive web content.\nFTP (File Transfer Protocol) is used for transferring files between computers, not typically for standard web browsing. SMTP (Simple Mail Transfer Protocol) is designed specifically for sending email messages, not for accessing web pages. ICMP (Internet Control Message Protocol) is used for diagnostic and error reporting purposes, such as the ping command, rather than defining how resources are accessed in a URL. Therefore, HTTP is the primary scheme associated with standard web URLs.