What type of data is encoded using light?

The correct choice is fiber optic, as it pertains specifically to the transmission of data using light. Fiber optic technology uses thin strands of glass or plastic fibers to guide light signals over long distances. The data is transmitted as pulses of light, which are modulated to represent information. This method of data transmission offers significant advantages, including higher bandwidth capacity and reduced signal degradation compared to traditional electrical signals.

When comparing fiber optic to other options, electrical signals involve the transmission of data through electrical impulses, typically found in copper cables. Radio waves are used for wireless communication technologies and involve the modulation of radio frequency signals, not light. Digital packets refer to units of data that are transmitted across networks, most commonly associated with data packets in IP networks, and do not specify the method of transmission. Thus, the unique characteristic of fiber optic technology is its reliance on light for encoding and transmitting data.