I bet the correct answer is C. Optical cables are the only way to support 1000 Mb/s Ethernet, right? Unless you want to lay down some seriously thick copper cables...
D seems like the most comprehensive answer. There are both copper and optical versions available for all of these Ethernet speeds, depending on the application and distance requirements.
Actually, the correct answer is D) There are copper and optical versions possible for all of these Ethernet data rates. It depends on the specific setup.
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