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The infrared transmission method in Electronic Aids for Daily Living (EADL) primarily relies on light signals to communicate with devices. This technology operates by emitting infrared light that is modulated to carry information, which can be received by compatible devices equipped with infrared sensors.

Infrared transmission is known for its line-of-sight reliance, meaning that the transmitter and receiver must have an unobstructed path to communicate effectively. Its usage is prevalent in remote controls and other assistive technologies because it's relatively simple to implement, inexpensive, and does not require complex infrastructure.

Other communication methods such as radio waves, wired connections, or Wi-Fi signals utilize different physical principles for transmitting information. Radio waves operate over longer distances and do not require direct line of sight, while wired connections necessitate physical cables for data transfer. Wi-Fi signals provide wireless networking capabilities but involve more complex setup and infrastructure than infrared technology. Hence, the correct choice emphasizes the unique characteristics of light signals in the context of EADL.