A、The nth layer provides services for the n+1 th layer
B、The n+1 layer adds a header to the message received from the nth layer
C、The n-layer header is used to coordinate protocol actions between the n-layers of adjacent nodes
D、The nth lay and the n+1 th layer have no influence on each other
喵查答案：The nth layer provides services for the n+1 th layer
What is correct in describing the relationship between the nth layer and the n+1 layer in OSI reference model
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