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The disadvantage of using a parallel mode of communication is ______

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The disadvantage of using a parallel mode of communication is ______

(a) It is costly

(b) Leads to erroneous data transfer

(c) Security of data

(d) All of the mentioned

This question was posed to me in an interview for job.

The above asked question is from Parallel Port topic in division Input/Output Organisation of Computer Architecture

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Right answer is (a) It is costly

Easiest explanation: The parallel mode of data transfer is costly as it involves data being sent over parallel lines.

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