The very popular form of multiplexing where multiple channels of digital data are transmitted in serial form is Pulse-Code Modulated Multiplexing (PCM). PCM is widely used for transmitting digital signals and is commonly utilized in various digital communication systems.
Here's a brief overview of the options:
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Frequency-Division Multiplexing (FDM): Involves dividing the frequency spectrum into several lower-frequency bands for simultaneous transmission.
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Phase-Shift Multiplexing: This generally refers to the technique used in phase-shift keying (PSK) but is not typically associated with multiplexing multiple digital channels in a serial form.
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Pulse-Amplitude Modulated Multiplexing: Relates to a modulation technique but is not a standard multiplexing method for transmitting multiple data streams.
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Pulse-Code Modulated Multiplexing (PCM): Involves converting an analog signal into a digital signal and then multiplexing it for transmission over various channels.
Thus, the correct answer would be Pulse-Code Modulated Multiplexing (PCM).