Which of the following is true about 'video' tag in HTML5?
A - HTML5 supports <video> tag which is used to embed a video file in an HTML or XHTML document.
B - The current HTML5 draft specification does not specify which video formats browsers should support in the video tag.
C - Ogg files with Thedora video codec and Vorbis audio codec are supported.
D - All of the above.
D - All of the above