题目：
选择题
What does the phrase “frame-based” mean appearing at the beginning of the article? __________
- A. All generations of Ethernet base on the same physical layer as the underlying frame.
- B. All generations of Ethernet are built on improving infrastructure from coaxial cable to twisted pair.
- C. All generations of Ethernet base on the same architecture formats and the same interfaces for higher layers.
- D. All generation of Ethernet conform to the multi-layers structure of the OSI reference model.
答案：
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