单选题According to RFC 3931，L2TPv3 utilizes the IANA assigned IP protocol ID of（）.A121B115C110D101E151F51
单选题
According to RFC 3931，L2TPv3 utilizes the IANA assigned IP protocol ID of（）.
A
121
B
115
C
110
D
101
E
151
F
51
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