Which of the following statements about layer 2 LAN switch are incorrect?

Which of the following statements about layer 2 LAN switch are incorrect?
A . LAN switch will modify the data link layer header of the packet and then forward it.
B . LAN switch can learn Mac address automatically.
C . LAN switch operates at data link layer.
D . LAN switch will modify the network layer header of the packet and then forward it.

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Answer: B