As shown in the figure, the forwarding of data traffic before roaming is STA-HAP-upper layer network, the forwarding method is direct forwarding, and the home agent is configured on the AP. After three-layer roaming, what is the direction of data forwarding traffic?

 As shown in the figure, the forwarding of data traffic before roaming is STA-HAP-upper layer network, the forwarding method is direct forwarding, and the home agent is configured on the AP. After three-layer roaming, what is the direction of data forwarding traffic?

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

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Answer: A