In copper cables, what type of data does the sending device transmit?

The correct answer is binary data because copper cables transmit information in electrical signals, which encode data in a series of binary digits (0s and 1s). When a sending device transmits data over a copper cable, it converts the information into a format that can be sent as electrical pulses representing these binary digits.

Each pulse corresponds to a binary value, allowing the receiving device to decode the information back into its intended format, whether that be text, audio, video, or any other type of data. The underlying mechanism that supports this transmission is based entirely on binary encoding, which is fundamental to digital communication systems.

Analog signals can also travel through copper cables, but these are typically used for different types of communication, like traditional telephone calls, and do not represent the standard digital transmission method found in most modern data communications. Similarly, while text and video data are indeed forms of data that can be transmitted, they must first be converted to binary format for transmission over a cable. Thus, the essence of the data transmitted over copper cables is primarily in the form of binary data.