The correct answer is Option 3: Both 1 and 2.

Li-Fi (Light Fidelity) is a wireless optical networking technology that uses light-emitting diodes (LEDs) for high-speed data transmission. It uses visible light communication (VLC) to transmit data at high speeds, which makes it an alternative to Wi-Fi.

Li-Fi technology is based on the principle of Visible Light Communication (VLC), which uses light waves to transmit data. The data is modulated and transmitted using LED lights, which can be switched on and off at high speeds that are not visible to the human eye. Li-Fi can transmit data at speeds up to 224 gigabits per second, which is several times faster than the fastest Wi-Fi technology available.

In addition to its high data transfer speeds, Li-Fi also has several other advantages. For example, it is more secure than Wi-Fi because it uses a directional signal that can be focused on a particular area, making it difficult to intercept. It is also less susceptible to interference from other wireless signals, making it a more reliable technology.

Li-Fi technology is still in its early stages of development and has not yet been widely adopted. However, it has the potential to revolutionize the way we transmit and receive data wirelessly, particularly in areas where Wi-Fi signals may not be able to penetrate, such as in hospitals and other medical facilities.