考试试题~高手进来帮忙解决

分) 为宣告PUBLIC DTD选择适当的语法？
(A) <!DOCTYPE PUBLIC Root_Name "Name_of_DTD" "URL_of_DTD"> (B) <!DOCTYPE PUBLIC "Name_of_DTD""URL_of_DTD" Root_Name> (C) <!DOCTYPE Root_Name PUBLIC "URL_of_DTD" "Name_of_DTD"> (D) <!DOCTYPE Root_Name PUBLIC "Name_of_DTD" "URL_of_DTD">