Digital communication represents information in discrete binary form, which allows receivers and repeaters to distinguish valid bits even when some noise is present. Regenerators can restore digital signals to near-original shape at intermediate points. This leads to lower error rates and better quality over long distances, so Option A correctly states a major advantage.
Option A:
This option is incorrect because digital communication is actually the one closely associated with computers and ICT systems. Digital networks form the backbone of computer communication, so saying they can never be connected contradicts reality.
Option B:
Option C is wrong because digital signals are precisely what most modern electronic devices store and process. Memory chips, disks and processors all handle digital data.
Option C:
Option D about handwriting misunderstands the nature of digital communication, which uses electronic signals, not pen and paper.
Option D:
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