In the network shown in the figure below, the data traffic before roaming is forwarded as STA-HAP-HC-upper network, and the forwarding method is tunnel forwarding. After three-layer roaming, what is the direction of data forwarding traffic?

In the network shown in the figure below, the data traffic before roaming is forwarded as STA-HAP-HC-upper network, and the forwarding method is tunnel forwarding. After three-layer roaming, what is the direction of data forwarding traffic?

A . STA-FAP-FAC-HAC-Upper Network
B. STA-FAP-FAC-HAC-HAP-HAC-upper network
C. STA-FAP-FAC-Upper Network
D. FAP-FAC-HAC-FAC-Upper Network

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Answer: A