HTML5中文件声明行的写法是<(________)>
A、 !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
B、 !DOCTYPE html
C、 !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
D、 !DOCTYPE html "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"