Which of the following statement is incorrect?

1.	Which of the following statement is incorrect?
A.	The CCITT Recommendation X.25 specifies three layers of communication: physical, link and network.
B.	The second layer of communication is the data-link layer
C.	Errors in the physical layer can be detected by the data link layer
D.	The fourth layer, in reference to the OSI model, is the session layer
E.	None of the above
Answer» E. None of the above

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Which of the following statement is incorrect?

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