What is transmitted as electrical impulses of encoded data?

The correct choice is "Signals," which refers to the electrical impulses used to transmit information in various forms of communication technology. In the context of audiovisual systems, signals carry data in the form of encoded electrical impulses, allowing for the transfer of audio and video information from one device to another. These signals can represent various types of data, including sound waves and visual imagery, ensuring that the intended content reaches the end-user effectively.

Options like "Frequency," "Wavelength," and "Data Packets" do not accurately represent the concept of electrical impulses transmitting encoded data in the same way. Frequency refers to the number of cycles per second in a waveform and is a characteristic of a signal rather than a means of data transmission. Wavelength is related to the distance between successive peaks of a wave and is also a property of the signal rather than the transmission method. Data packets, although essential for sending data over networks, represent a specific format of grouped data rather than the electrical impulses themselves that carry that data across devices. Therefore, "Signals" is the most appropriate answer as it encompasses the method of data transmission via electrical impulses.