Which accurately describes the 051 Model?

Which accurately describes the 051 Model?
A . It is a reference model that describes data flow over the network using four layers.
B. It is a reference model that is used to convert binary bits into analog signals.
C. It is a reference model that explains how data is created by the application layer.
D. It is a reference model that describes how data communications occur on a network.

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Answer: D