A data rate of 19,200 bps is required over voice grade lines. To accomplish this it has been decided that a form of multiphase modulation must be used. The voice channel can only accommodate a baud rate of 2400 signal elements/second. a) How many bits must be transmitted per signal element? b) If up to 128 phase angles can be supported is it possible to implement the system and if so how might it be accomplished?