The layer is the key to the operation of thunderbolt and what makes it attractive as a high-speed peripheral i/o technology. a. cableb. applicationc. common transportd. physical

The answer to the given question is the option "c".

Explanation:

In this question, the answer is "common transport". It is the layer responsible for end-to-end interaction that is used on the HTTP and FTP. This layer provides a logical interaction between applications that are run on different hosts within a layered protocol structure and other options are not correct that can be described as:

In option a, The cable stands for wire that is not a part of the layer. In option b, An application uses the common transport for interaction. that's why it is not correct. In option d, Physical is a part of the OSI model and it is used for bit-level transmission that's why it is not correct.

So the answer to this question is the option "C".  

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