Which of the following is correct about Server Side Events(SSE) in HTML5?
A - To use Server-Sent Events in a web application, you would need to add an <eventsource> element to the document.
B - The src attribute of <eventsource> element should point to an URL which should provide a persistent HTTP connection that sends a data stream containing the events.
C - The URL would point to a PHP, PERL or any Python script which would take care of sending event data consistently.
D - All of the above.