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单选题
In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）
A
Inserted between the MPLS label stack and the Layer 3 payload
B
Inserted between the MPLS label stack and the Layer 3 Header
C
Inserted between the MPLS label stack and the Layer 2 payload
D
Inserted between the MPLS label stack and the Layer 2 header
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