Question 3-78L3

Infrared (IR) communication is a common wireless method for programming radios. IR uses electromagnetic radiation, just below visible light, for short-range, line-of-sight data transmission. Many radios, especially older models, feature an IR port to receive programming data like frequencies, memory settings, and operating parameters from a computer or another radio without a wired connection. "Banding" (A) refers to the allocation of specific frequency ranges for various radio services, not a programming method. Option (B) is entirely fictional; ultraviolet light is not used for programming transfer and has no scientific basis for such an application. Option (D) is impractical and not a common method; direct programming of individual user radios by manufacturers via satellite is not a standard or cost-effective solution for routine radio configuration.