According to different network conditions, Layer 2 Portal authentication or Layer 3 Portal1 authentication can be deployed in the network. Which of the following descriptions is wrong?

According to different network conditions, Layer 2 Portal authentication or Layer 3 Portal1 authentication can be deployed in the network. Which of the following descriptions is wrong?
A . When there is a Layer 2 network between the client and the access device, that is, the client and the access device are directly connected (or only Layer 2 devices exist between them), then Layer 2 Portal authentication can be configured.
B . When using Layer 2 authentication, the access device can learn the MAC address of the client, and the access device can only use the MAC address to identify the user
C . When there is a Layer 3 network between the client and the access device, that is, there is a Layer 3 forwarding device between the client and the access device, you need to configure Layer 3 Portal authentication.
D . When using Layer 3 authentication, the access device can learn the IP address of the client and use the IP address to identify the user

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Answer: B