The _____ is used to transfer data from one host to another. A. TCP/IP B. FTP C. Protocol D. Transport layer

To answer the question regarding which option is used to transfer data from one host to another, we can analyze the provided choices:

1. TCP/IP: This stands for Transmission Control Protocol/Internet Protocol. It is a suite of communication protocols used to interconnect network devices on the internet. While it is essential for data transfer, it is not the specific protocol that handles the transfer of data directly.

2. FTP (File Transfer Protocol): This is a specific protocol used to transfer files between a client and a server on the internet. It is specialized for data transfer.

3. Protocol: This is a general term that refers to rules governing data communication. It encompasses various types, including protocols used for data transfer, but is not specific enough.

4. Transport Layer: This is one of the layers in the OSI model that provides end-to-end communication services for applications. It includes protocols like TCP and UDP, which can facilitate data transfer but is again more of a category than a specific method.

Final Answer

The correct answer is B. FTP, as it specifically refers to a protocol designed for transferring data between hosts.