单项选择题
A.〈iframe src="frame.html"width="600"height="240"frameborder="o"scrolling="yes"〉〈liframe〉
B.〈iframe src="frame.html"width="600"height="240"fr ameborder="1"scrolling="yes"〉〈liframe〉
C.〈iframe src="fr ame.html"width="240"height="600"fr ameborder="o"scrolling="no"〉〈liframe〉
D.〈iframe src="frame.html"width="240"height="600"frameborder="1"scrolling="no"〉〈liframe〉