A. a device that modulates an analog carrier signal to encode digital information
B. a device that modulates a digital carrier signal to encode analog information
C. a device that modulates an analog carrier signal to decode digital information
D. a device that modulates a digital carrier signal to decode analog information
B. a device that modulates a digital carrier signal to encode analog information
C. a device that modulates an analog carrier signal to decode digital information
D. a device that modulates a digital carrier signal to decode analog information
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