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【单选题】
In which tunnel-less VPN topology do group members register with a key server in order to receive the security association necessary to communicate with the group?（）A.
Easy VPN
B.
GRE tunneling
C.
Virtual Tunnel Interfaces
D.
DynamicMultipoint VPN
E.
Group Encrypted Transport VPN
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A.
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B.
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C.
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