What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?

What is the number of separate protocol layers at the serial interface

1.	What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?
A.	4
B.	2
C.	6
D.	3
E.	None of the above
Answer» E. None of the above

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What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?

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