单项选择题
A.＜meta name="viewport"content="width=device-width，initial=noscale"＞
B.＜meta name="viewport"content="width：device-width；initial-scale：1.0"＞
C.＜meta name="viewport"content="width=device，initial-scale=1.0"＞
D.＜meta name="viewport"content="width=device-width，initial-scale=1.0"＞