Which of the following statements is true?

Which of the following statements is true?
A . Compared with the shared hub, a port of the LAN switch can be said to be a separate collision domain.
B . When the LAN Switch receives a packet containing an unrecognized MAC address, it directly sends the packet back from the port it received.
C . The LAN Switch may not recognize the MAC address, but must recognize the IP address.
D . The LAN Switch mainly searches for the corresponding IP address according to the MAC address of the data packet to realize the forwarding of the data packet.

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Answer: A