The line that best demonstrates this purpose to explain different types of codebreaking to his readers is C. a more recent development is the so-called tempest attack, which aims to detect the electromagnetic signals emitted
This refers to the intention of an author when writing a book that he wants to communicate to his readers.
Hence, we can see that based on the given text, the author is of the opinion that codebreaking is relatively easy and wants to explain it and option C best does this.
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