The correct answer is FDMA.Access methods are multiplexing techniques that provide communications services to multiple users in a single-bandwidth wired or wireless medium. Communications channels, whether theyre wireless spectrum segments or cable connections, are expensive.There are five basic access or multiplexing methods:Frequency Division Multiple Access (FDMA),Time Division Multiple Access (TDMA),Code Division Multiple Access (CDMA),Orthogonal Frequency Division Multiple Access (OFDMA)Spatial Division Multiple Access (SDMA)Frequency Division Multiple Access (FDMA):FDMA is the process of dividing one channel or bandwidth into multiple individual bands, each for use by a single user .Each individual band or channel is wide enough to accommodate the signal spectra of the transmissions to be propagated. Additional InformationTime Division Multiple Access (TDMA):TDMA is a digital technique that divides a single channel or band into time slots.Each time slot is used to transmit one byte or another digital segment of each signal in sequential serial data format.Code Division Multiple Access (CDMA):CDMA is another pure digital technique. It is also known as spread spectrum because it takes the digitized version of an analog signal and spreads it out over a wider bandwidth at a lower power level.This method is called direct sequence spread spectrum (DSSS)