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Which principle was applied to form the OSI model? A. A layer is created only when a different level of abstraction is required. B. A layer should use a set of protocols to exchange data. C. There should be fewer layers for the model to work efficiently. D. The protocols working at each layer should use a particular port number.

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Answer: A layer is created only when a different level of abstraction is required.

Explanation: Each layer should perform a well-defined function. The function of each layer should be chosen with an eye toward defining internationally standardized protocols.

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