The X. 25 standard specifies three layers of functionality. Which layers of the OSI model correspond to the X. 25 layers? ( )

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问题 The X. 25 standard specifies three layers of functionality. Which layers of the OSI model correspond to the X. 25 layers? ( )

选项 A、the Data Link, Network and Session Layers
B、the Physical, Data Link and Network Layers
C、the Physical, Data Link and Transport Layers
D、the Session Layers, Network Layers and Presentation Layers

答案B

解析
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