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What is the purpose of the source and destination ports in the TCP header?

What is the purpose of the source and destination ports in the TCP header?

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A.
These ports identify the physical location of the sender and the receiver on the IP router.

B.
These ports are used as addresses to communicate with the IP layer.

C.
TCP does not use source or destination ports.

D.
These ports are used as an address to identify the upper layer application using the TCP
connection.

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