Answer:
"cleverly" and "is an expert"
Explanation:
"Subjective expressions" are <em>words, phrases or even sentences that makes a statement biased.</em> It is a person's personal thought about an event, a situation, another person and so on.
In the sentence above, the words "cleverly" and "is an expert" are both subjective expressions. The reader doesn't know what it means to "cleverly allude." The writer's way of cleverly alluding might be different from the reader. So, it goes the same way with the phrase, "is an expert." The writer personally thinks that King is expressing himself to be an expert. It is only a personal opinion and not a fact.
Both of the expressions are just according to the writer's feelings and thoughts.
The central idea of the paragraph from "The Code Book" is expressed by "Breaking the RSA code is the greatest challenge for cryptanalysts."
The meaning of the cryptanalysts is that someone who break the codes.
Despite the enormous strength of RSA and other modern ciphers, cryptanalysts are still able to play a valuable role in intelligence gathering. Their success is evidenced by the fact that cryptanalysts are in greater demand than ever before—the NSA is still the largest employer of mathematicians in the world.
Hence, the correct answer is "Breaking the RSA code is the greatest challenge for cryptanalysts."
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The word you could possibly be looking for is "intent"