HTML5的正确doctype是?

A.＜!DOCTYPEhtml＞(正确答案)

B.＜!DOCTYPEHTML5＞

C.＜!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML5.0//EN"

D."http://www.w3.org/TR/html5/strict.dtd"＞