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【单选题】
在 OSI 参考模型中,第 N 层和其上的 N + 1 层的关系是A.
N 层为 N ＋ 1 层提供服务
B.
N ＋ 1 层将为从 N 层接收的信息增加了一个头
C.
N 层利用 N ＋ 1 层提供的服务
D.
N 层对 N+1 层没有任何作用
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