Which of the following is an example of an email hyperlink in HTML?

The example of an email hyperlink in HTML is constructed using the "mailto:" protocol, which is specifically designed to create links that open the default email client to send an email. In the correct choice, "mailto:someone@example.com" specifies that when the link is clicked, it will prompt the user to send an email to "someone@example.com". This functionality is essential for websites that want to provide a convenient way for visitors to contact someone via email directly.

The other options do not serve the purpose of creating an email hyperlink. The first option creates a standard hyperlink to a web page, rather than an email address. The third option is designed for linking external stylesheets to an HTML document, and it does not pertain to email. The fourth option serves to display an image and has no relation to hyperlinking or email functionality. Understanding the role of each element helps clarify why "mailto:" is uniquely suited for email interactions in HTML.