单选题 What does the phrase “frame-based” mean appearing at the beginning of the article? __________ 的答案

All generation ofEthernet conform to the multi-layers structure of the OSI reference model.

All generations of Ethernet base on the same physical layer as the underlying frame.

All generations of Ethernet are built on improving infrastructure from coaxial cable to twisted pair.

All generations of Ethernet base on the same architecture formats and the same interfaces for higher layers.