The information in four analog signals is to be multiplexed and transmitted over a telephone channel that has a 400- to 3100-Hz bandpass. Each of the analog baseband signals is band limited to 500 Hz. Two system implementations are considered. a. For a system using FDM with single-sideband (SSB) subcarriers, draw a frequency spectrum showing the spectrum allocated to each signal. b. For a system using TDM with 4-bit PCM coding of the analog signals, determine i. The minimum data rate of each PCM encoder output ii. The total data rate of the TDM output iii. The bandwidth efficiency (N/B) required by the modem iv. A type of encoder that would achieve the total data rate needed in the provided bandwidth (i. e. provide the required bandwidth efficiency), assuming the filter factor d=0