Question

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

Answer 1

______✨ HEY MATE ✨_____

➡️ Option (b) is the right answer ✔️

✌✌Hope it's help u ✌✌

Answer 2

$\bold {\red{\large { option \ number \ B}}}$

2.....

I think it is the correct answer.....

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hope it help