The correct answer is C. Pulse code modulation.
Pulse-code modulation (PCM) is a method of encoding analog signals into digital signals by sampling the analog signal and converting each sample into a digital number. The digital numbers are then stored or transmitted.
PCM is the most common type of digital audio encoding. It is also used in many other applications, such as telephony, video recording, and data storage.
A. Peculiar code modulation is not a valid acronym for PCM.
B. Pulse codec machine is not a valid acronym for PCM.
D. Peripheral code machine is not a valid acronym for PCM.