【单选题】
A <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>IPSEC<{/td}>
<{/tr}><{/tbody}><{/table}>
B <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>SSL<{/td}>
<{/tr}><{/tbody}><{/table}>
C <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>L2TP<{/td}>
<{/tr}><{/tbody}><{/table}>
D <{table}>
<{colgroup}><{col}>
<{/colgroup}><{tbody}><{tr}>
<{td}>SET<{/td}>
<{/tr}><{/tbody}><{/table}>
查看更多
