题目内容
（请给出正确答案）
[单选题]
Which three options are valid WAN connectivity methods？（）
A.PPP
B.WAP
C.HDLC
D.MPLS
E.L2TPv3
F.ATM
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A.PPP
B.WAP
C.HDLC
D.MPLS
E.L2TPv3
F.ATM
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第9题
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