You develop an HTML5 chat application.

You need to provide real-time updates to the messages that users post in the chat application.

What should you do?

A. Use get o to obtain data updates.

B. Use a RESTful web service.

C. Use WebSockets.

D. Use ajaxo to obtain data updates.

Explanation:

Web Sockets is a next-generation bidirectional communication technology for web applications which operates over a single socket and is exposed via a JavaScript interface in HTML 5 compliant browsers.

Once you get a Web Socket connection with the web server, you can send data from browser to server by calling a send() method, and receive data from server to browser by an onmessage event handler.

Reference: HTML5 – WebSockets Tutorial